Susannah tracks down her ex-client, officer Louisa, who though initially hostile eventually opens up about a witness who saw her friend being killed by a man matching Jon's description. Louisa admits that she was threatened into silence and Susannah realises they might both be in imminent danger. Louisa sends Susannah a photo of the witness who she needs to find. As Susannah hurries away, it's clear that she too could now be a target.

Starring:

Sam Heughan, Imogen King, Antonia Thomas, Joely Richardson, Sacha Dhawan, James Nesbitt, Anne-Marie Duff, Richard E. Grant, Ben Miller, Niamh Algar

Genre:

Drama, Crime