Pitsi Pitsou, the island of the Pitsimpouins, is the safest, but also the most mysterious island in the world.

But one morning, it becomes the stinkiest as well. A terrible smell spreads everywhere during the big cooking contest. Thus, Little Blue, the island's only detective, takes on the smelliest case of all time.

There are many suspects, but to solve the mystery and find the recipe for success, the Pitsimpouins must work as a team – and of course, use their... noses!