The wealthy father of Anna-Lena van Dam, who has gone missing, sends out a team of six to find his daughter - including the ex-military Victor, the cave climber Dana and the parapsychologist Dr. Ingo Theobald. Each of the six is an expert in his or her field, each of them has something to hide. And none of them will leave the gigantic cave system underneath the estate of van Dams unchanged. Because in the dark, the team discovers mysterious doors, forcing them to take paths that go beyond all science and reason to save Anna-Lena. But through which door should they go to find the missing young woman ...?
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