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It takes eight minutes for the police to arrive. Randolph Tiefenthaler is waiting for them at the door to his apartment. He invites the officers in. His 78-year-old father is waiting in the kitchen.

“I shot the tenant in the basement apartment,” says the old man. A pistol lies in front of him: a Walther PPK 7.65 mm Browning. Six months earlier, all was still right with the world.