Outside Asheville, NC, a young mother is stabbed four times in the chest and left for dead in the French Broad River. But she lives long enough to seek out help -- and leave a cryptic clue for detectives.

When their car breaks down at the mall in Beaumont, TX, a young husband tells his wife to wait while he fetches their other ride. But when he returns minutes later -- she's mysteriously vanished. Does the nearby Big Thicket Swamp hold the answers?

When a Lakota teen disappears after a night out in the mostly white town of Mobridge, SD, deep racial tensions erupt. And after her body is found in the mucky shallows of the Missouri River, detectives are stonewalled on both sides of the divide.

On the morning of her 50th birthday, a woman is found face-down in Suqualena Creek near Meridian, MS, apparently drowned. But it's no accident. Her daughter and her best friend are distraught, but as detectives learn, both are hiding secrets.

A young woman's night of partying at a roadhouse in Krotz Springs, LA, takes a sinister turn when she vanishes from the parking lot. Her desperate boyfriend suspects she made a deadly connection with an old flame -- and the nearby Atchafalaya Swamp.

In Albany, NY, a young woman storms out of the house to track down her wayward boyfriend and disappears into the night. When her body is found washed up on the mucky banks of the Hudson River, detectives realize they have a killer on the loose.

When the Stewart family wakes up one morning, their 47-year-old mom, Kathy, is nowhere to be found. The last they knew, she went for a walk in downtown Ava, MO. But when her murdered body is found in nearby Cowskin Creek, the town erupts in fear.

While her husband is away, a vivacious Army medic enjoys a night out at a dive bar near Fort Bragg, NC. But she never makes it home. And though dogs pick up her scent in a nearby swamp, her fate baffles police -- until a local P.I. takes up the case.

A Marietta, GA, co-ed is eager to make the five-hour drive home to see her parents. But she never gets there. Her friends and coworkers have no answers, and when her body surfaces in the Oconee River, detectives realize that one of them is lying.

When a young woman leaves home to join up with a goth community in Manchester, NH, her mom figures it's just a phase. But when she later disappears from a roadside bar, it's clear that something truly sinister has happened