Upon his return from the safari in Africa, Nicolas finds a huge snake in his bag. Not knowing why, Nicolas does not tell his parents about the snake and manages to live with it during a year. The relationship between boy and snake is dangerous and fascinating, but precarious and strange.
This is a story where the boy's intelligence and instinct overcome every difficulty. Nicolas and the snake share a number of amusing adventures but the boy emerges from this experience with a much improved vision of life and himself. Nicolas would never be sure how the snake got into his suitcase and appeared in his bedroom back home. He could only guess it happened during the last night at the safari camp, when he forgot to zip up the tent. He imagined the snake creeping into the warm tent, sneaking inside his bag, and hiding underneath his clothes where it felt safe and comfortable.