I have always known the expression as Adam and Eve and Punch me, this is apparently the British equivalent. It is s a thrilling read.
We feel special to our mates, so it is a shock to discover an affair going on, the plot many writers use as a resort.
However, Ruth Rendell uses it as a recourse of a different colour. When Araminta Knox learns of the death of her ex, (is he really dead?) other women learn too that this dark-haired man, Jock Lewis, fits the description of a man they knew who fleeced them, a con, a thief, and about as suitable a partner as Bin Laden to your daughter.
Enter a ghost or two, one so scary Minty starts to carry a knife. She is obsessive, and hears voices. Rendell explores the psyche of her characters who reside in and around London, where a serial killer appears to be at gruesome work.
Throughout, this is a strong, suspenseful, psychological thriller.