But it is perhaps even more terrifying because it is based on the true story of agency nurse Delia Balmer's near fatal relationship with axe murderer John Sweeney. Branded the 'scalp hunter ...

Consider yourself warned: You may be surprised by some of the entries on this list. Here are the 25 best horror movies based on true stories.

True crime has long fascinated viewers ... foreshadows the psychological horror story in the documentary. The horror is not ...