Ron Mitchell has killed twice, but he is not a murderer acting out of cold calculation or manic delirium. He is led to murder by subconscious logic, built on the idea of unredeemed sin. Ron feels this in his soul, but his mind does not answer the question of when, where, how he committed the crime that turned his life into hell. Determined to reveal the secret of his crimes, Ron turns for help to a successful psychiatrist, Martin Gibbs, who practices in the precarious borderland of the spiritual and material worlds. But the hopes of both are destroyed by failure. The risk of another murder increases every day. Martin offers an extraordinary solution - to subordinate Ron's subconscious to a different logic of action at the moment when he has to kill. The chance is slim, but Martin is confident in his genius, and Ron is confident in Martin. Both are unaware of the key link that will unpredictably turn the situation into the very peak of its development.