The pressure to unravel the mystery surrounding Sir Peter’s death intensifies. Meanwhile, Judith’s intrigue about a set of coded crossword puzzles sends her on a journey that could very well give her the inspiration and tools to unravel the whole mystery. But Judith, Becks and Suzie will have to act fast, because as relationships within the Bailey family worsen, Sir Peter might not be the only target.

This all-new adaptation of Robert Thorogood’s novel The Marlow Murder Club stars Samantha Bond (Downton Abbey, Home Fires) as Judith Potts, who is joined by Jo Martin (Doctor Who, Back to Life) as Suzie Harris, Cara Horgan (The Sandman, Traitors) as Becks Starling and Natalie Dew (Sandylands, The Capture) as DS Tanika Malik.