Carlo and Malik race to recover a human heart that was to be transplanted into a teen patient, but stolen en route to the hospital for ransom.

Carlo and Malik investigate the death of a man who had gotten himself beaten up to cheat on his insurance in order to help his family.

As Carlo's team grieves and investigates the shocking death of one of their own, suspicion falls on a fellow co-worker.

The police investigate the death of a homeless woman who, despite having run away from home years before, had held onto a memento of her daughter.

When a hoarder is found murdered in his home, Malik must work with the psychologist who'd been monitoring the victim's disorder to solve the case.

The murder of a social worker casts suspicion on her former partner, who used to beat her and was at her home the night of the murder.

When a personal trainer at a country club is found poisoned, the police discover he'd been juggling several paid sexual relationships with clients.

While investigating the death of an architecture student, Malik makes a promise to a child that he can't keep, which brings unexpected consequences.

When the body of a young man is found at a dumpsite, the police discover the victim was involved in illegal boxing matches to support a baby on the way.

Days after a young man inquires about his friend's cause of death; he too is found dead. Carlo's team learn the motive behind their co-workers' murders.

As the police uncover the truth behind the recent murders of their two co-workers, Marta and Muzo must come to terms with past choices they made.