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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.

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.

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.

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.

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.