GAC travel to the mystical country of Ireland to investigate locations steeped with demonic activity, while also covering the origins of Halloween. To start their Irish adventure, they begin with a trip to the cave at Rathcroghan; the birthplace of Samhain. Nick and Billy investigate the Leap Castle north of Roscrea in Clareen, Ireland's most haunted castle, to look for the "elemental", Zak, Aaron, and Jay investigate the Hell-Fire Club Lodge, on Montpelier Hill. They learn about the stories of Satan visiting the premises and the mythological creatures of Massy Woods, including a banshee. Next, they hear the legend of the Black Cat of Killakee that haunts the Stewards House which sits at the bottom of the hill. The guys regroup to for their journey south in County Wexford for their lockdown in Loftus Hall, Ireland's most haunted house, outside of Duncannon, where the devil is believed to have stayed the night.