Written in Stone (A Books by the Bay Mystery) has a story within the mystery. It also has older main characters, which is nice. I don't have anything against twenty somethings, but it's nice to see older people finding a life partner and solving the mystery.
In Written in Stone Olivia Limoges gets summoned to visit Munin Cooper, a reclusive old woman also known as the Witch of Oyster Bay, who warns Olivia that death is coming. Munin gives Olivia a homemade memory jug with tokens encrusted in the pottery which has clues to secrets in the community and possibly to Olivia's mother who died when Olivia was very young. Shortly after they meet, Munin is found dead of a supposed snake bit.
Although Olivia is preparing for the Coastal Carolina Food Festival, she doesn't believe that Munin's death was accidental and she and the rest of the Bayside Book Writers investigate. As they start to identify the jug’s contents and unraveling secrets from the past, they also come face-to-face with a murderer.
If you like cozies, I recommend this series by Ellery Adams.