South Florida diver Briana Devon, co-owner of Two Mermaids Marine Search & Salvage Shop, can't believe she's all alone when she surfaces from the Gulf waters to find both her twin sister, Daria, and their boat gone. Bree knows Daria would never leave her stranded in the ocean, especially with a horrific storm bearing down on them. With no other recourse, Bree fiercely swims with the rough waves to the nearest land she can see, until a lightning strike throws her through the water and she blacks out.

Cole DeRoca, owner of Gulf Stream Yacht Interiors, is fighting to get his sailboat secured on an outer island when he sees the unconscious woman wash up on shore. He's able to revive Bree enough to get them both onboard his sloop. Now, it will take all of his strength and willpower to brave the storm again and find the medical help she needs.

The aftermath of sharing this traumatic experience creates a strong bond Cole and Bree don't fully understand, and will not deny. Bree feels she can trust Cole with anything, and she'll need his strength and support when she discovers her twin's fate. As Bree sets out to investigate exactly what happened to Daria, she becomes ever more certain it was not an accident and that foul play was involved. Bree also learns her twin was keeping secrets -- but was that enough reason for someone to kill her?

Ms. Harper deftly takes readers are a suspenseful and harrowing underwater adventure that will have you holding your breath in anticipation of the outcome.