The series, based on the novel by German author James Krüss, tells the story of Timm, the boy who traded in his contagious laugh for the ability to win any bet. The man who did the devilish deal with Timm is wealthy businessman Baron de Lefouet, who is even more successful in business now that he has Timm's engaging laugh to win him friends. Timm, on the other hand, soon realizes that life is not the same without the ability to laugh, and he sets out to find the evil Baron and try to regain the ability to laugh.