London Kills tells the story of a team of top murder detectives, shot like a documentary. Each episode features a different murder in addition to a serialized story involving the lead detective’s missing wife.Construction workers find the remains of a young man who appears to have been strangled to death more than a year ago, but when his sister is notified, she claims he's been sending her postcards all the while. Rob and Vivienne start to suspect David is hiding something.