When the body of SAS officer Tom Sunderland is found in a shallow grave, DI Ken Jackson becomes caught up in a messy love triangle involving Sunderland's wife Lucy and his best friend, fellow army officer Sean Brook. As the dead man's GP, Joanna finds herself increasingly involved in the case when she realises that only weeks before, Sunderland told her his wife was out to kill him. Was Sunderland the victim of a crime of passion or was he simply delusional and suffering from paranoia? It's a sad day for the Dangerfields as the family, along with Joanna, attend Alison's boyfriend Ben's funeral. Alison is inconsolable and blames herself for his death. To assuage her grief, she gets drunk and hysterically throws herself at one of Ben's friends. Meanwhile, Marty walks out on his job as a dishwasher and makes a conscious decision to go back to university and study disabled sports.

• Don Shaw

• Idris Elba
• Jim Carter
• Hugh Dancy