Fantastic premise and execution! I loved puzzling out how all the pieces fit together; relishing my accuracy, and delighting even more when the story twisted away!

There's a minor error in the first half of the book, which tripped me up and made me think there would be a supernatural twist later:
the morning of the wedding, when Hannah's legs are stuck and sinking in the peat, she clearly identifies Duncan and Pete as her rescuers.
A few chapters later, when the lads are venturing out during the power outage, Duncan remarks (to Pete, who is now stuck!) how he and Femi had unstuck Hanna.

...I was waiting for that other shoe to drop, a la bodysnatcher-cum-groomsmen.
Ah, well. Maybe in the next book ;)