Gavin Bell and his teenage sister Fleur come from a middle-class family. Their much-loved, old-fashioned robot, Grumps, is running down and can't be repaired, so a scientist friend loans them EGR3, an experimental new robot to help Grumps. EGR3, known as Eager, learns from his experiences, as a child would. He feels emotions--wonder, excitement, and loss. When the ultra high-tech, eerily human BDC4 robots begin to behave suspiciously, Eager and the Bells are drawn into a great adventure that is sometimes dark and often humorous. As Eager's extraordinary abilities are tested to the limit, he will try to find the answer to this question: What does it mean to be alive?