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Ben's is thirteen and an only child. You'd think he was entirely used to being the centre of attention, then, wouldn't you? But this isn't really the case. Ben's parents are academics. His father is a fiercely ambitious behavioural psychologist and his mother is both completing her doctorate and acting as her husband's research assistant. Ben is used to coming second to the advance of science. He can cope with that. Usually. But then his parents up sticks and move him all the way across Canada. Why? Because his father's new university is prepared to underwrite his new project - raising a chimpanzee as human and trying to teach it American Sign Language.
So, Ben has not only left school and friends behind, he's being asked to accept a new baby "brother", and a new house that's going to be more of a laboratory than a home. You can't really blame him for feeling resentful, can you? But the chimp, Zan, chisels his way into Ben's affections. His infectious personality and ability to form genuine attachments soon turn him into a real member of the family, as far as Ben is concerned, at least.