A city is left reeling when a much-loved couple are killed by gunfire. Initial signs point to a home invasion, but there may be more to this heinous crime.

A young couple are randomly beaten by a group of teenagers in Lancashire, England. A 20-year-old dies and detectives are determined to bring the perpetrators to justice

A community is distraught when a 16-year-old is murdered in an alleyway in Burlington, Iowa. The investigators are under pressure to pursue the killers.

When the bodies of two men are found stabbed to death in neighbouring flats in Derby, England, detectives need to act fast to find the killer

A beloved Spanish teacher is found in her bathtub in what appears to be a tragic accident. One first-on-scene investigator isn't convinced, but can he bring the killer to justice?

A body is found by a river in Cumbria, England - 70 miles from home. Eight years of tireless investigative work pass until one vital piece of evidence blows the case wide open.

A victim is partially decapitated during a home-invasion turned murder scene in Miamisburg, Ohio. Investigators must work against the clock to unravel the ghastly crime.

Outside Cromford railway station in Derbyshire, England, Senior Investigating Officer Tony Blockley and his team find a perplexing murder scene and launch an inquest.

North Ridgeville, Ohio. The body of a woman is found at the end of a cul-de-sac. Detectives launch a full-scale hunt to solve this unthinkable murder in an idyllic town.

A womans body is found at a pumping station in Hull, England. Senior Investigating Officer Paul Davison and his team are tasked with identifying her and how she was murdered.