Retired archaeologist Judith Potts' peaceful evening in Marlow is shattered when she witnesses a brutal murder. With the local police -led by newly promoted DS Tanika Malik - reluctant to believe her story. Judith teams up with local dog-walker Suzie and unfulfilled vicar's wife Becks to investigate. As the bodies begin to pile up, the unlikely group of sleuths must use all of their skills to piece together clues, grill suspects, and face down real dangers as they race against the clock to stop the killer in their tracks.