Kidwella Castle in northern Wales is rumoured to be haunted by a deadly ghost, the Grim Widow, who allegedly drowns unsuspecting guests in the castle's moat. M.J Holliday has the ability to talk to ghosts, so when she and her T.V crew arrive to film their ghost-hunting cable TV show, Ghoul Getters, mysterious things start to occur. Not long after their arrival, two new victims are added to the widow's grisly roster. Fear ripples through the castle, especially when it is discovered that the victims may have had help into their watery graves from someone alive.