 Duca (Darlan Cunha) is a smart teenager that lives in Porto Alegre with his father Laerte (Airton Graça) and his mother Cléia (Dira Paes). His best friends are the also teenagers Isa (Sophia Reis), for whom he has a crush, and Kid (Renan Augusto), for whom Isa has a crush. One night, his uncle Éder (Lázaro Ramos) visits his family and informs that he has just killed the former husband of his girlfriend Soraia (Deborah Secco). Duca finds mistakes in the story told by his uncle, and decides to investigate the tragic event.