Hilton Head Intrigue is the fourth in a series featuring the adventures of Clint Harrison, the sheriff of a small Colorado town. Cliff and his new wife, Mary Alice, honeymoon on Hilton Head Island, hoping for several days of romance, relaxation and sightseeing. While on the beach, they meet a stranger who offers to take them on a sailing trip around the island. All goes well until Clint becomes curious about strange lights seen offshore. Their new friend tries to convince Clint to ignore the strange occurrence, but Clint's cop instincts tell him that something foul is afoot. His curiosity leads him into dangerous waters, and he learns too late that he should have heeded their new friend's warning. He soon learns that this investigation may turn out to be his last.