Three improv actors are hired by the police to help stage low-level stings. Their instinct to "always say yes" without breaking character leads them deep inside London's criminal underworld.

An exploration of the Met’s investigation into Sarah’s murder, how this devastating crime unfolded and its impact. Told by those closely involved in the case from the outset, many of whom are speaking on camera for the first time, including the Senior Investigating Officer, the Prosecuting Barrister and Sarah’s local MP.