Flare And Flesh. Undertow Sins, #18

The safest place I ever found was in the hands of a man everyone else was afraid of. Saskia Pierce didn't walk into the Texas Gulf at 4 AM to die. She walked in to disappear. Fleeing a systematically cruel surgeon, the meticulous tattoo artist carries nothing but the clothes on her back and a stolen phone containing the recording that could finally destroy him. But when a deadly rip current pulls her under, she is rescued by Dorian Holt-a scarred, disgraced former Coast Guard swimmer who operates by his own violent moral code.
Seeing the faded bruises on her ribs, Dorian does the only thing he knows how to do to keep her safe: he carries her into his isolated, concrete-and-steel rescue station and bolts the heavy storm shutters from the inside. Trapped in a sweltering sixteen-by-twenty-foot room, Saskia refuses to be a helpless victim. A tense psychological battle of wills unfolds between her and the dangerously controlled vigilante.
But as a massive tropical storm barrels toward the coast, sealing them off completely from the outside world, their captivity shifts into a dark, intoxicating alliance. With her abuser closing in, Saskia and Dorian must use their combined damage to rewrite their pasts-and survive the storm.