Sam Ryan recruits the Lyell team to investigate the assassination of the health secretary, but Nikki is unsure whether Sam knows more than she's letting on.

David Leon, Díana Bermudez, Emma Beattie, Gaia Wise, Gina Bramhill, Hugh Quarshie, Ian Puleston-Davies, Jacqueline Oceane, Lloyd Everitt, Matthew Gravelle, Shireen Farkhoy, Stephen Donald, Tom Benedict Knight, Will Bowden