"After the fire chief visits the day care, Caillou has exciting dreams of growing up to be a firefighter"--P. [4] of cover.

Caillou is playing dinosaur hunter with Gilbert the cat. Caillou goes for a snack, and when he comes back there's no sign of Gilbert. He's disappeared! Mom says Caillou will have to be a detective, so together they search the house for clues. Eventually they find Gilbert curled up fast asleep in Caillou's bed.