A jealous Oliver threatens to ruin the lives of many as he makes a shocking discovery about Charles. John's plans are jeopardised, making him dangerous; he enlists the help of the Trenchard staff to stoop to new lows.

Cast: Paul Ritter, Philip Glenister, Richard Goulding, Alice Eve, Tamsin Greig, Jack Shalloo, Adam James, Mark Rose, Ian Attard, Martin Bishop, Harriet Walter, Tara Fitzgerald, Ella Purnell, Stephen Chapman, Paul Bown