From the Junior novelization:
-Steve, Sam, Nat, and Wanda are in Lagos, Nigeria tracking Crossbones. Hes working as a mercenary now and breaks into the Institute For Infectious Disease and steals a deadly virus. Fighting ensues, the your Bucky line happens, Steve angsts over Bucky and lets his guard down enough for Crossbones to draw him closer, then Crossbones tries to blow them both up. Wanda uses her power to lift the bomb into the air but shes not strong enough and cant contain the blast. It explodes in the air and rips through a floor of a hotel, to her devastation.
-Tony is at an MIT graduation. A home movie is being played of Maria Stark playing the piano and Tony filming her. Tony seems to be really close to his mom. Howard comes in and acts kind of douchy. Maria kisses Tony on the cheek and asks him to play piano with her like they used to. The video cuts off there cause Tony recorded over it with a TV show. Tony gives a speech to the graduates and announces theyll be recipients of the Howard and Maria Stark Foundation grant, all of their projects approved and funded.
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- Tonys backstage after a press conference after the graduation. A woman walks up to him and asks if he even knows how many people hes killed. She gives him a picture of her son who died in Sokovia and gives him a lot of crap, blaming him and the Avengers for her sons death. Tony is emotionally wrecked by the exchange.
-Back at the Avengers Compound Wanda is watching the news and upset about the people who died in Nigeria. Steve says its not her fault and blames himself for not noticing the vest bomb when he was busy angsting about Bucky. Vision enters the room through the wall and scares Wanda. Steve had asked Vision to let him know when Tonys arrived, and Tonys now there with General Ross.
-The discussion about the Accords happens. Unlike the comic, there doesnt seem to be any kind of registration for all superheros. Theres no talk of people having to reveal any secret identities. The Accords say that the Avengers will only operate under the supervision of a panel, and only when and if the panel deems it necessary. Anyone who wont sign the agreement will be forced to retire. In particular Ross concern is about Wanda and Vision because theyre crazy powerful. They have 3 days to sign, then the Accords ceremony will be held in Vienna.
-The team debates about the Accords. Steve and Sam are completely against it. Rhodey and Tony are completely for it. Vision looks at it from a statistical point of view and feels oversight shouldnt be outright dismissed. Tony talks about the kid who died in Sokovia. The exchange weve seen in the video clips happens; Tony says if they dont do this now, it will be done to them later. He looks at Wanda and she says theyll be coming for her. Vision says theyll protect her. Nat says maybe Tony is right. Steve is disappointed in Nat and leaves.
-Okay, here things get weird and theyve clearly omitted Peggys funeral from the book. Right after Steve leaves it says a full day later Steve hasnt reported in and Nat goes and finds him in an old church. Now we know the scene in the church is related to Peggys funeral, but theres no mention of the funeral happening or anything about Peggy at all in the book. Probably all skipped for spoilers. Anyway, Nat talks to Steve and she says shes leaving tomorrow for Vienna to go to the Accords ceremony. She, Tony, Rhodey, and Vision have all signed. Clint says hes retired, and Steve, Sam, and Wanda dont sign, making them now no longer Avengers.
-Next day Nat is at the ceremony in Vienna. There she meets both TChalla and his father TChaka. Theyre there because some people from Wakanda were killed during the incident in Nigeria. While TChaka is giving a speech a bomb goes off. Nat and TChalla are fine but TChaka is killed, (I think; it doesnt say it outright but its implied. I assumed they didnt outright say it cause its a book for kids.) (I should mention, in the conversation prior to all of this TChalla seems chill and like a nice guy but afterwards he is just straight up NO CHILL through the rest of the book.)
-Now it gets confusing to me again here. In interviews the other day Emily VanCamp said that Sharon is working in Berlin, but here in the book now Sharon is in the US, hanging out in a hotel room with Steve and Sam, and it says that Sharon and Steve had become good friends since after CATWS, but in interviews we were also told that Steve doesnt even find out who Sharon really is until the funeral, so?? I dont know whats going on here. But anyway, the three of them are chillin in a hotel room when they see on TV the news about the bomb at the Accords ceremony. Tony is giving an interview, doing damage control. The news then plays CCTV footage of the person seen setting the bomb and its Bucky. Sharon gets called in to work and leaves on a military plane for Vienna.
- Nat is still on the scene looking things over and Sharon is now somehow magically there 10 minutes later. I dont even know? None of this makes sense. TChalla is pissed and plans to take care of the bomber himself.
- Steves phone rings and he and Sam are now suddenly in Vienna too. Nat calls and asks him to stay out of things. (Remember, hes no longer an Avenger now. Anything he does is on his own.) Steve says hes got to be the one to bring Bucky in because hes the least likely to die trying. He goes into the cafe where Sam is. Sharon comes in shortly after and gives him information on where Buckys been located - in Romania. Sharon is about to report it to her bosses, but this gives Steve and Sam a headstart.
-Bucky is walking down the street in Romania, checking out some fruit stands. A man looks at him, freaks out and runs away, leaving his newspaper behind. Bucky looks at the paper and sees hes accused of the bombing in Vienna. Bucky heads home fast, planning to leave another home behind.
- Steve has arrived at Buckys shabby apartment. He notices the fridge is unplugged and opens it to find it filled with weapons and ammo. The kitchen table has stacks of notebooks on it. Steve opens one. There were hastily sketched maps and illustrations, random words written in an almost unreadable scrawl. It looked like the efforts of a distorted mind spilled across the pages.
-Bucky comes home and Steve asks if he knows him. Bucky says, Youre Steve. Steve steps towards him and Bucky steps back. Bucky says he read about Steve at a museum. Sam is watching outside and comes over the comms and tells Steve the GSG9 is coming for Bucky. Steve can tell by the look in Buckys eyes that Bucky doesnt actually remember him, just knows of him from the museum. (omg, yes it says this stuff, its straight up fanfiction level here). Bucky says he wasnt in Vienna, he doesnt do that anymore. Steve says theyre coming to get you, etc. the stuff we heard over a different scene in the trailer. GSG9 is coming but Steve keeps going on. You pulled me out of the river. I dont know why I did that. Yes, you do, said Cap, looking Bucky in the eyes. Yes, this is straight quotes. While this is happening Sam is on comms freaking out while Steve ignores him to stare in Buckys eyes.
- The GSG9 troops break in. Bucky reacts automatically, seemingly programmed, grabs Steves shield to take cover from bullets and pounds his metal fist into the floor. He pulls out the backpack which hes stored for emergency. It contained weapons, cash, fake IDs, and everything else he would need to flee effectively. Theres no mention of notebooks and the ones on the table are left behind. :( Bucky knocks out everyone, leaves the shield and runs off with his backpack. As hes fleeing, Black Panther jumps out to reck his ****. A chase ensues and leads to the rooftop where a GSG9 helicopter shoots at Bucky. Steve takes cover, Bucky runs away, Black Panther probably laughs at the puny bullets from behind his mask, and Sam takes out the helicopter.
- The whole motorcycle chase scene then starts. Steve gets into someones SUV, Black Panther ends up riding on top of it at one point and at another point ends up riding on top of Sam. (lol, not like that) After Bucky gets knocked off the bike everyone starts to brawl and Black Panther scratches the shield. It ends with Rhodey arriving and firing a repulsor at the ground near them. The troops circle them, Steve looks at Bucky, Buckys thinking about making a break for it but knows he cant. Cap whispered to Bucky, No, dont. Its what they want you to do. Bucky doesnt like it but understands. Everyone is arrested. Rhodey says he feels like hes arresting his father and his idiot brother. Black Panther takes off his mask and Steve and Rhodey recognize him as TChalla.
- It then goes back to Avengers Compound. Wanda is beating up a punching bag when she smells something cooking that reminds her of home. She goes in the kitchen and finds Vision cooking a Sokovian dish to cheer her up. She tastes it while its cooking and he tells her hes never eaten anything a day in his life. It tastes terrible but she tells him its good, then takes over cooking it to try and fix it. They talk about their weird powers and people being afraid of them. Wanda decides the food still sucks and gets her purse to go to the store for something. Vision blocks her path and suggests ordering a pizza instead. Wanda gets annoyed that hes blocking her and he admits that Tony doesnt want either of them leaving the Compound to avoid any incidents.
- Back to the others, who are being transported to Berlin. Steve, Sam, and TChalla are in one truck. TChalla doesnt want to talk to them. Steve tells him Bucky is innocent. TChalla says that innocent men dont run.
- They arrive at the task force headquarters and are taken into the building. They watch as a modified forklift pulls a cage off another truck, with Bucky inside. There they meet Everette Ross (Martin Freemans character) who says Bucky is going to be taken for psych evaluation and extradition. Sharon is there too but doesnt say anything to them. Everette rolls his eyes at Steves suggestion of getting Bucky a lawyer and tells Sharon to see that their weapons are locked up because its a secure building. The shield, Sams wings, and TChallas suit are all carried off.
- Guards lead them into the building where they meet with Nat. TChalla goes into an office with Everette while Nat, Steve, and Sam go into another room where Tony is there, on the phone. Tonys again putting out fires, trying to make arrangements to get them out of trouble. He says Ross wants them prosecuted. Steve says hes not getting the shield back is he and Tony says the shield and wings are still government property.
-TChalla uses his influence as future king of Wakanda to pressure the world authorities to extradite Bucky to Wakanda to face several charges, including terrorism. Meanwhile Bucky is undergoing psychological evaluation. Its widely understood that he was brainwashed but they dont know anything about any residual effects the conditioning might have caused.
-In the room with Tony, Steve watches the evaluation on a live feed monitor. On screen the doctor asks Bucky questions and hes slow to answer and appears confused. Tony tries to talk Steve into signing the Accords as a way to get them all off the hook. He says apparently it looks bad when Captain America wont sign your accords so if hell do it they can make everything that happened with them going after Bucky look legit. Bucky could go to a nice American psych center instead of a Wakandan jail. Steve knows its the only way to help Bucky. Tony presses it, telling Steve he (Tony) needs him, and Steve starts to bend a little. He says its not impossible but there needs to be safeguards. Tony starts to cheer up and is ready to get to work amending things. He says once the public relations fire is put out hell find a way to reinstate Steve and Wanda. Steve asks whats this about Wanda, and Tony admits shes confined to the Compound to protect her. Steve doesnt think its protection but imprisonment and is disappointed in Tony. Tony says its the best option because shes not an American citizen and they wont give her a visa because shes a weapon of mass destruction. Steve says shes just a kid. Tony says people just want to feel safe. Steve says, well youre doing a great job so far.