A girl is killed in the park one night. The suspect is obvious, but charging him is not so easy…

There are new victims, and the criminal seems to be mocking the police. Sometimes he acts chaotically and stupidly, leaving lots of traces and witnesses, other times—coldly and professionally like a ghost.

Who is the investigation up against—an incredibly lucky amateur or a devilishly clever and cunning professional?

As a practical investigator, Cord has to make a choice: throw all his strength into trying to outmaneuver and capture the killer or try to preserve the personal happiness that he has just found. Will his choice lead to disaster? What if true evil is not the killer at all? What if the true evil is love and friendship?