Very Scary People

It's the late 70s, and a baffling mystery plagues Northern California's popular hiking trails -- a serial rapist and murderer dubbed the “Trailside Killer” terrorizes the area. Investigators find few clues -- until one brave victim manages to get away.

It's the late 70s, and a baffling mystery plagues Northern California's popular hiking trails -- a serial rapist and murderer dubbed the "Trailside Killer" terrorizes the area. Investigators find few clues -- until one brave victim manages to get away.

Police must outwit a sly serial killer who calls himself "Slave Master."

Police must outwit a sly serial killer who calls himself "Slave Master."

Identical Twins aren't always alike, especially when one might be a killer.

Identical Twins aren't always alike, especially when one might be a killer.

The only thing scarier than a serial killer is one hiding in plain sight.

The only thing scarier than a serial killer is one hiding in plain sight.

Cops wonder if a series of deaths means a black widow is spinning her web.

Cops wonder if a series of deaths means a black widow is spinning her web.

The murder of Taunja Bennett is the first of many bodies found in the Pacific Northwest, California, and beyond. Police never link the deaths until someone starts sending macabre letters signed with a happy face. Is this the end -- or just the beginning?

A happy face is a joyful symbol -- unless it's on a letter from a killer.