In the UK, the dismembered body of a woman leaves a couple, obsessed by serial killers, in the frame. In the US, a hidden camera provides vital evidence to help bring justice to a family.

In the US, a missing 15-year-old girl is found dead by cadaver dogs. In the UK, a mystery needs to be solved to identify a dismembered body in a suitcase.

In the US, a woman's murder in her garage is recorded on camera while police pursue their suspect to the Mexican border. In the UK, a woman is found in her bedroom choked, smothered, and stabbed 54 times after a night out.

In the US, recordings provide vital evidence to solve the death of a man's wife. While in the UK, a feud leads to a house fire that kills four young children and their mother.

In the US, a 5-year-old boy is found dead after going on a trip to Disneyland with his father. In the UK, a parking dispute escalates into a double murder.

In the US, a camera hidden in a bag of chocolates solves a murder in a laundry room. In the UK, a gloating social media post entraps a killer.

In the US, a Thanksgiving party ends in tragedy for a married couple, dismembered in their own home. In the UK, a woman is found dead in the woods after being stalked by a stranger.

In the UK, police investigate the disappearance of a 5-year-old boy from his home overnight. In South Africa, local law enforcements use CCTV to retrace the steps of a local drug gang.

In the US, a sister tracks down her brother's killer by becoming an amateur sleuth. In the UK, CCTV is the main witness to identifying the killer of a mother of four.

In New Zealand, a British backpacker is found dead after a Tinder date. In the UK, a 13-year-old girl is killed in an attempt to cover up an inappropriate relationship.