This is Whispers on the Dock (by Moi), book 3 in the Nantucket Dreams series from Guideposts! Just got the box yesterday!
It’s a light-hearted Christian women’s fiction series with a light mystery thread. You can read about the series here at Guideposts Books.
Patti Berg wrote book 1, and Pam Hanson and Barbara Andrews wrote book 2. I got to conclude the mystery thread in book 3. :)