Diana Bakewell is London’s savviest and best connected tour guide. As the lead guide at Chartwell and Crouch Tours, she’s busy teaching her young assistant Zaf the ropes alongside dealing with company politics and her slimy boss. In her spare time she’s helping Zaf find his feet in London and coming to terms with the fact that a tabby cat called Gus has stowed away on her vintage tour bus. But when Diana and Zaf take a group of students on a tour of the Houses of Parliament and an MP's researcher dies, Diana suspects all is not as it seems.

When an accident forces Felicia Grant back to her family’s auction house in Stamford, she vows it’ll only be a flying visit. But as the gavel falls on the final lot, a hidden secret is revealed—the body of her father’s business rival, murdered during the packed sale! Soon, Felicia is swept into a mystery that has everyone in the community as a potential suspect―including her. As the body count rises and with the people she loves under threat, Felicia takes matters into her own hands. But even the most picturesque place has its secrets.

England, 1930. An antiques dealer is found robbed and murdered in a third class train compartment on a remote Suffolk branch line. The police believe they know who the killer is, and an arrest is soon made. A passenger on the same train, the Reverend Lucian Shaw, country parson and former army chaplain, is concerned that the police have the wrong man and begins an investigation of his own. Before long, Shaw is drawn into a web of intrigue, deceit, and murder which lurks beneath the surface of a seemingly peaceful country parish.

December 1927. Mystery-writer Marius Quin has one previous bestseller, endless looming mortgage payments, and no idea how to write his next book. When his childhood friend Lady Isabella Montague invites him to an intimate New Year’s Eve party hosted by a narcissistic actor, Marius seizes upon the distraction. With his perpetually glum Basset hound along for the ride, he navigates the snowy lanes to the opulent estate of Everham Hall. As the celebrations begin, fireworks light up the sky, champagne corks pop, and then the host is murdered…

1929: Miss Clara Vale is a woman ahead of her time. Rather than attending Oxford to bag an eligible Duke (as her mother, Lady Vale, so desperately hoped), she threw herself into a degree in chemistry, with aspirations to become a scientist in her own right. But the world isn't ready for Clara. Unable to land a job in science because she's a woman, she is stuck behind the desk at a dingy London library. Until her estranged Uncle dies suddenly, leaving her his private detective agency, and laboratory, in his will.