Maite launches a complex follow-up operation. Tomás, who uses up the last hours before the crime expires, gets dangerously close to the person who committed it.

Maite sees how her investigation seems to stagnate, until something unexpected happens. Someone in her environment could have the key to making an important breakthrough.

Tomás and Maite discover that not everything is what it seems in the cases they investigate. The past of the suspects and the victims make them doubt every step they take.

Tomás and Maite's investigations cause their relationship to suffer, and Maite begins to wonder if she is making a mistake by staying so close to him.

Maite discovers that the investigation at the Arsenal is full of dark spots and secrets to be revealed. For his part, Tomás has finally found a case that stimulates him: a crime that is about to expire after twenty years.

Maite and Tomás get together again. Tomás, conditioned by the progress of his illness, has lost faith in finding a case that interests him again. Maite takes charge of a matter at the Military Arsenal, an environment with very rigid rules.