He must hunt her down. Kill her. Destroy her …

In her very first case, criminal psychologist Lena Peters is confronted with a killer on a murderous vendetta. And though she is unaware, Lena will play a prominent role in his deadly mission, because Lena knows what makes killers tick - she also knows all about obsession, for she has been close to the edge herself.

For now she is the hunter, but soon she will become the hunted.