A British woman is found dead after a date; a girl is killed to cover up an inappropriate relationship.

A sister tracks down her brother's killer; CCTV is the main witness to identifying the killer of a mother.

A couple are found dismembered in their own home; a woman is found dead after being stalked by a stranger.

A camera hidden in a bag of chocolates solves a murder; a gloating social media post entraps a killer.

Police investigate the disappearance of a 5-year-old boy; a young girl's body is discovered in a field.

In the United States, a five-year-old boy is found dead after going on a trip to Disneyland with his father, and in the United Kingdom, a parking dispute escalates into a double murder.

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

In the United States, a missing 15-year-old is found by cadaver dogs. In the United Kingdom, a mystery needs to be solved in order to identify a dismembered body found in a suitcase.

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