A mystery at the Incredible Hotel

The world baking competition is coming up. It is taking place at the Incredible Hotel and will judged by guest of honour, Chef Tartine. Stefan has perfected his chocolate cake recipe but on the morning of the event ... the recipe is nowhere to be found. Luckily, the best detective in Delaunay is on hand -- Stefan's best friend, Matilda. Who can the thief be?! Everyone has their theory and Mr Starch, the hotel manager, is ready to point the finger...