Set on the sunny Gulf Coast of Florida, Harbinger centers around two lifelong friends and fishing charter boat partners, Boyd Tomlin and Hicks Ledoux. Boyd is the serious one who always makes sure things get done, and Hicks is the carefree one who always makes sure everyone has a good time.

But times aren't so good. They are struggling to get charters, and bills are coming due. In desperate need of money, they consider smuggling drugs to make ends meet. By chance or fate, they meet two beautiful sisters who will change everything—a young Ania and her kid sister Karolyn. Hicks is immediately attached to the brash, confident Ania while Boyd gravitates toward Karolyn.

As romance blossoms, Boyd and Hicks quickly find themselves embroiled in the world of illegal drug trade, romance, danger and violence lurking around every corner.