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Federal prosecutor Leo Ramírez is tasked with arresting Paul Schäfer, the leader of the German sect "Colonia Dignidad" in southern Chile, on charges of child abuse. Leo grew up in Colonia, but left when his brother died 20 years ago. It's the first time back from him.

Leo takes Klaus to his sister Carmen's house. He is initially unsure if he can trust Klaus, but a shared memory proves Klaus is his brother. Leo and Pamela discover that Hausmann forged Pedro's death certificate.

After Pamela convinces Leo to get professional help, he reveals details about their childhood.

Leo visits a pastor who attended a party in Colonia on the day Pedro 'died'. Among the guests were Manuel Contreras, former head of Chile's secret police, and an unidentified German businessman.

In Santiago, Caro and her colleague Hannelore make some discoveries about the German businessman.

The buried cars are found to belong to missing dissidents of the Pinochet regime, tortured and killed at the colony. Caro informs Leo of the arms deals and asks him to look for additional shipments.

Leo, Pamela, Klaus and Anke arrive at the embassy, but Caro is not there. Leo sets out to search for his wife, while Pamela takes Anke and Klaus to safety.

The dark tunnels trigger violent memories for Klaus. Klaus and Leo find Schaefer's secret surveillance room. In a final confrontation, Leo must choose between capturing Paul Schaefer or saving his brother.