20/20 Britain's Most Notorious Crime Investigations

When her child vanishes abroad, a mother is desperate to uncover the truth.

A Christmas disappearance and a wrongful arrest lead to a hunt for a hidden killer.

The suspicious deaths of two neighbours raise questions about a charming churchwarden.

A serial killer hides in plain sight for decades until detectives close in.

A former aide to the Royal Family goes on the run after her boyfriend is found murdered.

A fatal car chase and chilling 999 call lead police to a viral TikTok mother-daughter duo.