Mum of three Natalie Hemming went missing in May 2016. With extraordinary access to Thames Valley Police and also to Natalie's family and friends, this gripping programme follows the search for her.

Cameras follow Thames Valley Police's investigation into the murder of 64-year-old Hang Yin Leung, who died after being violently assaulted during a burglary at her Milton Keynes home in January 2017. Filmed over 12 months, the programme interweaves the police's enquiries with an intimate portrait of a British-Chinese family coming to terms with the impact of murder, with the story of migrants from Hong Kong who came to the UK in search of a better life for their son unfolding alongside the hunt for the killers.