From Beneath

On a long drive to visit a relative at their newly acquired remote, rural farmhouse, Sam and Jason decide to cool off in a pond they find. Whilst swimming, Jason is bitten by a strange leech-like creature. When he attempts to remove it, part of it rips off and crawls inside his leg. When they arrive at the farmhouse, there is no-one home. Jason's leg has turned infectious and begins to spread throughout his body. Clues begin to reveal that there may be more to their host's absence than previously thought. Can the pair discover what happened to their missing relatives in time to save them, and to stop the isintegration taking hold of Jason's body?