Jill Walker finds her daughter, Emma, cold to the touch in her own bed. Quickly ruling out suicide, investigators search for a suspicious man in black caught on a neighbor's home surveillance camera.

Hugo is hysterical after he finds his brother's girlfriend, Breanna Schneller, beaten and stabbed to death; the brothers appear to be devastated, but the discovery of Breanna's missing phone casts doubt on their alibis.

In Post Falls, ID, devoted family man Bo Kirk vanishes, and his truck is found set ablaze; Bo's sister blames their estranged father, until released ATM security footage points to one of his co-workers who has piercing blue eyes.

MaryAnn Clibbery is brutally murdered at the remodeling business she owned in Loves Park, IL; then, a suspicious bag found floating in an icy river unlocks the secrets of her brutal slaying.

When Marty finds his big brother Mike Rust's home in disarray with a motorcycle missing, the Saguache, CO, community leaves no stone unturned searching for one of their own. The case of the missing mountain biking pioneer, living off the grid in Colorado, went cold for years, but the local rumor mill heats up.

In Noble, OK, a dog drops a human skull onto its owners' front porch on Christmas Day; after six years and no leads, the police must navigate the twists and turns of the victim's past to find justice.

In Monroe, OH, an affluent retirement community is baffled after Barbara Howe simply vanishes one night; the police soon find her body in the trunk of her car, with her throat slit.

Carol Lapaglia waited 25 years to marry the love of her life, Jack Parkes; six weeks before their wedding in Kennedy Township, PA, she finds him shot to death in their living room.

In Moscow, ID, an elderly couple frantically performs CPR on their young neighbor after a pop of gunfire interrupts their bedtime routine; investigators follow fresh footprints from the scene, only to learn the killer may already be behind bars.