I'm delighted you loved Murder on Cape Cod, Becke!
I was drawn to that title because, while I've never been to Cape Cod, my sister-in-law used to live there for part of the year, and she and my brother visit the Cape regularly (they live in Vermont, so it's not far). My aunt and uncle, who lived in the Berkshires, used to go there every summer. I've heard so much about it, I hope to go there one day. I'm on the opposite coast in Eugene, Oregon, so I won't be traveling there anytime soon. In the meantime, it was fun to read your book about it!
I read a Jane Langton book set in Nantucket a few months ago - I'm not sure that's technically Cape Cod. I've been looking for copies of Philip R. Craig's Martha's Vineyard mysteries which are both hard to find and very expensive. I thought I'd read some Aaron Elkins books set in the Cape Cod area, but so far I'm only finding Elkins books set in other parts of Massachusetts. I must be unintentionally building up a collection of books set in the Cape Cod area. I need to rearrange my books by where they take place. Turns out I have a lot of books set in MA. Who knew?