Unsolved Serial Killers: 10 Frightening True Crime Cases of Unidentified Serial Killers (The Ones You've Never Heard of) Volume 1

Discover the chilling true stories of killers who stalked their victims undetected and remain free to this day...

When you hear the word "monsters", you probably conjure visions of gruesome and otherworldly creatures -- vampires, spirits, demons, and more.

Yet the most terrifying monsters in history aren't the ones you see on the big screen. No horror movie music cues when you cross paths with them or when they spot their first victim.

No, these vicious killers are much subtler. These monsters...