Plundered Christmas — Susan Lyttek

Compelled to spend Christmas on a private island with her father's future bride and her family, Jeanine learns that Margo Banet is descended from a pirate queen. Relatives and friends all have their reasons for attending the festivities--including the legendary treasure. But when Margo's nephew winds up dead and a violent storm cuts them off from the mainland, Jeanine has to wonder if they will solve the mystery before someone else dies trying.