Season 11 premieres with a lockdown inside Iowa's Edinburgh Manor, which Zak and Aaron investigate for signs of a menacing dark entity known as "The Joker," but they are hindered by inexplicable technical issues and an intense uncomfortable feeling.
The team investigate Tennessee's Old Lincoln County Hospital after hearing nurses' tales about the "Angel of Death" stalking dying patients. While on lockdown, the guys believe they see a shadow figure in the basement.
A trip to Las Vegas, N.M., finds the team receiving access to two reportedly haunted hotels. Included: They investigate the Castaneda Hotel and the Plaza Hotel, where an aggressive spirit is said to be targeting women.
Zak must face one of his deepest fears while investigating the Clown Motel in Tonopah, Nev., which is believed to be haunted by miners who perished in a 1911 fire. Later, Aaron seems to be physically impacted by a negative presence during a lockdown at a high school that has been abandoned for 60 years.