A championship swimmer is practicing her laps in the lake. She seems to hear something then is pulled under by an unseen force. Her body is never found. Add her to the list drowning victims claimed by Lake Manitoc over the last 35 years.
The guys pose as agents with the US Wildlife Service and pump Will Carlton, the dead girl's brother, for information. He says he thought he saw something grab her, but he was pretty far away. When the guys go to the sheriff, he pooh-poohs the idea of something in the lake drowning the girl. They dragged the lake and used sonar, but found nothing. He also tells them that the dam broke and lake is draining. Soon it and the town will be gone. They're interrupted by Andrea, the sheriff's daughter, and her son Lucas. Lucas is pathologically withdrawn. Dean tries hitting on Andrea while she walks them to a hotel, but Andrea shoots him down. Sam is amused.
Sam doesn't think they're up against a Nessie-type creature no one's ever reported anything in that lake, and monsters tend to get spotted. They discover one of the drowning victims was Andrea's husband, Lucas' father. Lucas was on a floating dock when his dad drowned, and he hasn't spoken since.
Dean tries to bond with Lucas in the park, but Lucas seems more interested in playing with his army men and drawing pictures of whirlpools, houses and bicycles. He gives Dean a drawing of a house. That house turns out to be the Carlton abode, where Will is preparing dinner for his dad, who is nearly catatonic with grief. The sink fills with brown lake water. When Will tries to figure out what stopped up the sink, something drowns him.
Using another one of Lucas' drawings of a house, they track down an elderly lady whose son Peter disappeared 35 years ago while riding his bike. They see a picture of the young Bill Carlton with Peter, and figure he may have killed the boy. Apparently Bill has realized Peter's spirit is to blame for all the deaths in his family. He takes a boat out, and the guys see it ram into some invisible force. Bill disappears.
The guys run into Andrea and Lucas at the sheriff's office again. Lucas is tremendously upset. The sheriff tells the guys he knows they're not wildlife officers, and tells them to get out of town. Sam agrees after all, the spirit of Peter must be satisfied now that Bill Carlton is dead. Dean isn't so sure he wants to see if Lucas is ok. Good thing Andrea decides to take a bath, which is a very bad idea. She's dragged under the water. The guys arrive in time to save her.
Andrea thinks she's going crazy she heard a voice say "come play with me!" Dean finds an boy scout troop picture, which includes the sheriff, Bill and Peter. Lucas leads them out to a spot in the woods. The boys dig up Peter's bicycle. The sheriff finds them, and they confront him he and Bill killed Peter, and now Peter's is making sure his killers feel the same pain his mom felt. Andrea comes out and is horrified when the sheriff confesses they were just kids, fooling around, but it got out of hand and they accidentally drowned Peter! Dean wants to take care of the spirit by digging up the body, burning it and covering it with salt. No luck the kids dropped his body in the lake.
Something lures Lucas from the house up to the lake. A hand grabs him and drags him under. The sheriff sees Peter's gray face staring at him. The guys jump in after him. The sheriff wades in as well, begging Peter's spirit to take him and spare Lucas. Peter obliges, dragging the sheriff down. Dean saves Lucas from the water.
Andrea and Lucas find the guys as they prepare to leave town. Lucas made them sandwiches something he tells them himself. Dean teaches him heavy-metal catchphrases. Andrea kisses Dean goodbye, and Dean looks smitten. But they head out anyway, off to slay the next monster.
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