Once Ida nearly died at the hands of a killer. Now she's trying to live again, to forget the monsters in her head. But the nightmares are coming back, more terrible than ever. Because Ida, now working as a journalist, has uncovered evidence of a serial killer stalking Helsinki's streets. And no one - not Ida, not homicide officer Kerttu Leppänen, tortured by her own demons - can stop them. Sometimes the monsters are real. And hunting them can destroy you.