Anne tells Caroline a secret which puts the women in opposition; a surprise guest at a lavish party hosted by Caroline forces James to reveal a truth that threatens to tear the Trenchards apart.

Cast: Tamsin Greig, Gary Lilburn, Philip Glenister, Martin Bishop, Harriet Walter, Saskia Reeves, Penny Layden, Bronagh Gallagher, Richard Huw, Jack Shalloo, Tom Wilkinson, James Fleet, Adam James, Diana Hardcastle, Nigel Allen