In the third-season opener, Don Wildman explores London, England, above and below ground to uncover its violent crimes, extreme poverty, and lawlessness during the chaotic Victorian period.

Host Don Wildman travels to Sicily to trace the Mafia's roots back to a secret vigilante society in an underground network that was created to put corrupt city officials on trial and execute the guilty. Included: the escape route of a mob boss; a bone crypt; and bunkers used during World War II by the Axis powers.