Ice cream makes your detective brain more efficient. Artur, Mariana, and Pedro have a very exciting life: Their father is a detective at the local police department. When they come home from school, they first hear about the new crimes that happened in town. This time, a very precious violin has been stolen from a rich man living in an old mansion. The three of them decide to conduct their own investigation. And they soon find the main suspects. But who really robbed the violin? The housekeeper who needs the money for her mother’s medical treatment, the music teacher who loves violins, or the lawyer responsible for the instrument’s safety . . . Artur, the younger brother, has his own investigation methods, and after some elbow grease and ice cream, the three of them discover the truth . . .