Sam and Dean investigate a series of mysterious drownings written off as suicides. They discover the spirit is an angry little boy with the power to travel through water who is taking revenge on certain town inhabitants for a dark secret buried long ago. Dean forms a bond with a young boy who seems to have the power of premonition.

Sam and Dean are once again on the FBI’s “Most Wanted” list when two Leviathans clone the brothers and go on a killing spree. The subject of a nationwide manhunt, Sam and Dean need to drop off the grid so Bobby sends them to Frank Deveraux, a quirky surveillance expert, for help. Meanwhile, Bobby continues to search for a way to kill the Levianthans, or at least slow them down, so the real Winchesters can stop their evil doppelgangers.