A group of tourists in New Orleans looking for off-the-beaten-path experiences decide to take a haunted swamp tour during Mardi Gras. Among them is Ben, who is looking to distract himself from a recent breakup. He convinces his friend Marcus to join him on the tour. Along with them are a diverse group of tourists, including a couple making a honeymoon video and a pair of aspiring actresses. Their tour guide, Shawn, is comically unprofessional and provides a less-than-reassuring introduction to the area's folklore, specifically the legend of Victor Crowley, a deformed man who was supposedly killed by a hatchet when he was a child and now haunts the swamp.

As their boat navigates deeper into the swamp, it becomes clear that the trip is far from the safe, spooky entertainment they anticipated. When the boat becomes damaged and leaves them stranded, the group must find a way to survive the night in the unforgiving terrain. Lost and increasingly desperate, they make their way through the murky waters and dense foliage, encountering signs that the legend of Victor Crowley might be horrifyingly real. Faced with an escalating series of violent and terrifying events, the group must work together to find a way out — but the swamp holds more dangers than they had ever imagined possible.