Case Sensitive (2011)

Part one of two. New DS Charlie Zailer finds herself working with DC Simon Waterhouse for the first time when Geraldine Bretherick and her five-year-old daughter Lucy are found dead in the bathroom of their luxury home, and the two argue about whether the case is one of murder, suicide or something more sinister. Meanwhile, a woman tells her best friend she had an affair with Bretherick's husband and wants to see him again. Thriller, based on the novel Point of Rescue by Sophie Hannah, starring Olivia Williams, Darren Boyd, Rupert Graves and Amy Beth Hayes.