Margaret and Ted are excited to be taking a vacation together. Margaret has always wanted to see the sights the United Kingdom has to offer. They leave the island, planning for two weeks of adventure together. York is their first stop. In addition to enjoying their time in the historic city, Ted has a friend living there that they plan to see on their visit.
James Long is a police inspector in York. He's happy to see his friend, Ted, in part because he has a cold case he wants to discuss with another inspector. Margaret is happy to listen in while they talk about the case. And Mona somehow manages to hear all about the case as well.
While Margaret and Ted explore the city, they also revisit a few of the key locations from the cold case. And whether it's Mona's interference or just luck, they also find themselves bumping into some of the case's suspects.
They're only supposed to be in York for a week. Margaret wants to see all of the sights, but the more she learns about the death of Douglas Sims, the more she wants to help James and Ted find his killer before she and Ted move on to their next location.