Bones discovered in the Ludwig mine. When Chief Inspector Elin Akay receives the emergency call, she immediately knows what it is about: The Wandering Dozen have been found. Twelve miners who were trapped in the mine 34 years ago. But the rescue workers don’t recover twelve skeletons – they find thirteen.
The thirteenth victim died from a gunshot wound. The bullet is still in the skull, found by miner Werner Flemming. Flemming is one of the survivors from the original disaster. The discovery retraumatizes him, and he remains silent. Elin Akay brings in forensic psychiatrist Jana Fäller as a consultant. She is the best in her field, and her late father was involved in the original mine disaster. She knows the miners, and they trust her.
Elin Akay and Jana Fäller investigate among the miners. They uncover secrets that have been hidden under the mine's heavy rock for too long. When the identity of the thirteenth victim is revealed, the web of lies threatens to collapse. One of the miners took up arms all those years ago. And to protect the truth, they might do it again.