A wedding on a budget. A honeymoon booked last minute. An urban legend that rises to the surface.

After dealing with a sneaky otter and an expanding guest list, Cody and Demetrius manage to get married without a single monster crashing the event. Afterwards, Cody whisks Demmy away on the honeymoon trip he planned all on his own... after putting it off until the last minute and booking it all online, sight unseen.

To their happy surprise, the cabin Cody reserved is quite comfortable and very secluded, situated on an island in the middle of the deep Heaversford Lake, and accessible only by boat. But as usually happens to the guys, trouble has a way of finding them. For not only is the lake home to Esther, a monster similar to the one in Loch Ness, but shortly after they arrive a storm knocks out the power and a local resident drowns under mysterious circumstances. The clues all point to Esther being somehow involved, and Demetrius and Cody quickly realize they're going to have to do their own style of investigation.

Before they realize it, their peaceful honeymoon is shattered and they find themselves fighting for their lives in the cold, dark waters of Heaversford Lake.