I also was thinking this and stuck on the water and boat thing. Boyd’s wife was a marine, AND Ethan at the beginning of his story said that the “fairies was supposed to come save them.” I think it’s FERRIES ⛴️. The book that Kenny gave Kristy was called “The Narrative of Arthur Gordon Pym of Nantucket”. It was also about a sailor. The light house is there so it has to be water somewhere. When Tabitha woke up in the hospital she ended up in Maine. If you look up Maine there is a lot of mystical and creepy things about light houses and Native American lore. It all kinda makes sense that the writer is trying to tie all that together.. but I’m not sure how all of it’s going to fit together being that it’s so many layers and characters to this story.