Still waters
(Book)

The Island by Heather Graham : Reclusive collector Cutter Merlin is seldom seen in Key West - lately, not at all. Officer Liam Beckett visits Merlin's curious house and discovers the gentleman in his study. In his death grip: a volume of occult lore and a reliquary. His eyes are wide with fright, his mouth a horrified rictus where spiders now dwell. Kelsey Donovan returns to the old house to catalog her estranged grandfather's collection, and cannot ignore the sense that she's being watched.

Below the Surface by Karen Harper : On a diving expedition, Briana Devon surfaces to find that her twin sister and their boat have vanished. Faced with exhaustion and a fast-approaching storm, Briana swims to a nearby barrier island, where she is revived by Cole De Roca, who had also taken shelter on the island. Bound to Cole by the harrowing experience, Briana turns to him as she struggles to understand what happened to her sister, her twin, whom she thought she knew.