Magnus and Will are called to make a straightforward retrieval of a rare Abnormal off the coast of Louisiana. With a commissioned helicopter, the retrieval is successful and their cargo securely on board. But as the pair starts heading back to the mainland, something causes the unusual sea creature to break loose. Unable to control the Abnormal and the helicopter simultaneously, Magnus and Will make a crash landing and find themselves entangled in guy wire, precariously dangling over an abandoned oil bore well several feet above the water in the middle of the Gulf of Mexico.
With the Abnormal nowhere to be found, Magnus concludes it has made its getaway into the depths of the water. But their solitude doesn't last long. Not only does the Abnormal return, it's even angrier than before. And Magnus and Will quickly learn they must escape or become its next victim.