The Devil and the Deep Blue Sea by Elise Noble

It all started with a turtle and a pair of designer sunglasses...
A bodyguarding gig in the Caribbean? Living the dream, right? Former Navy SEAL Knox Livingston soon finds out the trip is no vacation. Pop princess Luna Maara is a pain in everyone's ass, including the local judge's. When Luna finds herself sentenced to a month of community service at a turtle sanctuary, Knox hopes she might finally rethink her behaviour, but little does he know, the nightmare is only just beginning.
Caro Menefee moved to Valentine Cay to escape her past, and the last thing she needs is a rich brat and her entourage invading the peaceful paradise. Although Knox and his equally cocky buddy sure are pretty to look at. And that's all she's going to do: look. She swore off men before she left California, and she has quite enough to worry about without adding two toned six-packs into the mix. The turtle population is declining at an alarming rate, and she's not convinced it's all down to natural causes. Will Knox help or hinder her quest to save a species? And will Caro join the turtles on the endangered list?