As tensions reach boiling point inside the bank, Number 1's past comes to the fore. After raiding a suspect's home, Paco gives Maider a valuable tip.

Three months after a failed coup d'état, armed men storm Barcelona's Central Bank, taking hundreds hostage. A young journalist is the first on the scene.

Isabel takes a risk and publishes Maider's hypothesis. Following a new lead, the police make headway and the Civil Guard presses for armed intervention.

Maider defies Isabel's orders and butts heads with Berni. Number 1's plan hits a wall as conflicting theories about the attackers' identities emerge.

The siege reaches a tense climax. As the government releases an official version of events, Maider fights to uncover the full truth, no matter the cost.