Ana Alvarado is a former zookeeper turned software tester. When Blue Gamma offers her a job as animal trainer for their digients--digital entities, spawned by genetic algorithms to provide pets for players in the future virtual reality of Data Earth--she discovers an unexpected affinity for her charges. So does Derek Brooks, an animator who designs digient body parts. The market for digients develops and expands, cools and declines after the pattern of the software industry. Meanwhile Ana, Derek, and their friends become increasingly attached to their cute and talkative charges, who are neither pets nor children but something wholly new. But as Blue Gamma goes bust and Data Earth itself fades into obsolescence, Ana and the remaining digient keepers face a series of increasingly unpleasant dilemmas, their worries sharpened by their charges' growing awareness of the world beyond their pocket universe, and the steady unwinding of their own lives and relationships into middle-aged regrets for lost opportunities. Keeping to the constraints of a novella while working on a scale of years is a harsh challenge. Chiang's prose is sparse and austere throughout, relying on hints and nudges to provide context. At times, the narrative teeters on the edge of arid didacticism; there are enough ideas to fill a lesser author's trilogy, but much of the background is present only by implication, forcing the reader to work to fill in the blanks. (Indeed, this story may be impenetrable to readers who aren't at least passingly familiar with computers, the Internet, and virtual worlds such as Second Life.) Fortunately, sheer conceptual density keeps the story solidly real. The life cycle of the software objects in question is viewed through the prism of the human protagonists' own life cycle, and this skeleton is the armature on which hangs that very rare thing: a science fictional novel of ideas that delivers a real human impact.

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