Section D receives intelligence about a possible assassination attempt on a major oil dealer. Beth, newly recruited into MI5, goes undercover as an oil agent to protect him, but the operation goes badly. Subsequent surveillance of the dealer reveals a plot to acquire a deadly nerve agent. Lucas meets up with an old flame.

When a group of tourists on a New Orleans haunted swamp tour find themselves stranded in the wilderness, their evening of fun and spooks turns into a horrific nightmare.