Zacharias Calm possesses a special gift: as a Traveller, he can connect with the consciousness of other people. With his ability, he plays a significant role in solving crimes. One day, other Travellers suddenly stop returning from their journeys into the consciousness of their clients. Where have they disappeared to? Is there a crime behind it? Together with the therapist Florence, Zacharias sets out to search for his colleagues. A dangerous mission begins in mental worlds, where the line between reality and dream soon blurs. And then Zacharias and Florence face a ruthless opponent who even threatens reality itself.