I read cozy and historical mysteries, a bit of Paranormal/UF, and to mix it up, I read science and gardening books on occasion.
 
An island resort, only accessible by boat, with no cellphone coverage.
Early pages yet, but this one looks like it will work for Locked Room Mysteries (Locked Island??), MAYBE Country House (do island resorts count?) and definitely Murder Most Foul.
I think any of these books in the series work well as stand-alones too.
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