Serial killers have been with us for decades. The internet has put them in our pockets

A pair of teens go on a murderous rampage and their exploits are immortalized in the most shocking video ever to circulate the internet, "3 Guys, 1 Hammer"

A serial killer with over 100 kills to his name walks free and becomes a Youtube sensation

A psychopath lures victims through online dating to use as "research" for his twisted film project

Psycho.com is a chilling look at what happens when murderous minds meet modern technology by the bestselling author of The Darkest Web

This book expands on three cases originally released in edited form for the Casefile True Crime podcast:

• Pedro Rodrigues Filho, aka Pedrinho Matador, aka Killer Petey
• Dnepropetrovsk Maniacs, aka the Hammer Maniacs
• Mark Twitchell, aka Dexter Serial Killer