The Captain's Chest — Odette C. Bell

An action adventure packed with danger, mystery, and just enough romance, the Trouble and Treasure series follows the adventures of Amanda and Sebastian as they try to track down one of the most valuable treasure maps in the world.
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Book Three of the Trouble and Treasure Series:

Amanda and Sebastian have flown all the way to the Caribbean, and this is no holiday; they are after the third Stargazer. But Sebastian finds himself a little distracted when the hottest damn treasure hunter in the world pops up on his patch. Is she after his globe or something else entirely? Sebastian soon finds himself running around the island, playing her games, while Amanda is left to her own devices. But all too soon trouble arrives to the tune of an entire gang of Romeo's goons.

Can Amanda and Sebastian stay out of trouble long enough to get their hands on the third Stargazer? And can Sebastian finally learn that all that glitters is not gold?