A serial killer on the loose, crucifying his victims to trees and let them die suffering for long hours. A profiler on his heels, a young lady with a bloody past of her own. And a dark secret that once started it all. When Tatjana von Galen studied criminal psychology, she was well aware, German experts deny the usability of offender profiling, even the existence of the methods per se. But then, Tatjana knows probably more about monsters than each of those experts. She was herself once the only surviving victim of one. And when she gets her first case, the first case at all for a new founded department at EUROPOL, she has to face her own demons. The hunt leads her from Germany to the U.S., to England, Italy, the the Iraq and back to England and every time, she comes nearer to her dangerous prey, every time, the demons scream louder inside her mind and in the end, she has to realize two things: A cornered monster bites and much more, even monsters have reasons.