Sweets Begorra by Connie Shelton (Samantha Sweet Series, Book 7) from Books In Motion.com

Samantha Sweet learns that an Irish great-uncle left her an inheritance, so she and Beau change their honeymoon plans and go to the Emerald Isle. Will the gift be something lavish and wonderful, or is there no pot of gold waiting for Sam? Meanwhile, before Sam fully has the answers to her questions, a new mystery presents itself when a local charter boat is found adrift near the rocky Irish coast, its occupants missing. The family of the captain wants answers and when it looks like a group of Americans might be implicated, the Galway homicide detective in charge of the case enlists Beaus help. With all the extra excitement, the honeymooners begin to wonder if they will ever find some romantic time alone.