Martin, a kitten, is branded a `wimp' by his siblings for his friendly interest in mice.He loves caring for them and can't understand their desire for freedom.Only when he becomes the pet of a big city apartment dweller does he realize why his pets deserted him.An engaging animal fantasy with plenty of humorous insight into the human condition, King-Smith's story has humor and a fast pace which will appeal to younger readers.--School Library Journal (starred review)