Defying Stagger's direct orders, Kat continues to look into Dana's case - and learns that she might not have known Josh as well as she thought she did.

Cast: Rosalind Eleazar, Lenny Henry, Ashley Walters, Mary Malone, Jessica Plummer, Charlie Hamblett, Catherine Ayers, Lisa Faulkner, Richard Armitage, Oscar Kennedy, Deepica Stephen, Felix Garcia Guyer, Steve Pemberton, Will Barnett, Kieran Burton, Alex Waldmann, Brigid Zengeni, Simon Kunz