The house between tides

"Following the deaths of her last living relatives, Hetty Deveraux leaves her strained marriage behind in London and returns to her ancestral home, a crumbling estate in Scotland's Outer Hebrides, with the intention of renovating and reselling it as a hotel, much to the dismay of the locals. As she dives headfirst into the repairs, she discovers human remains beneath a rotting floorboard in the basement, with few physical clues to identify the bo...