Decked (Regan Reilly Mysteries, No. 1)

Regan Reilly, a private investigator, attends a reunion in England, when the body of a friend, Athena, turns up.
Unfortunately, Lady Exner's companion gets sick and Regan is given the opportunity to accompany Lady Exner on a transatlantic cruise.
Clues to Athena's crime will follow her on the Queen Guinevere boat, and she will in no time solve her friend's 10-year-old murder.
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When P.I. Regan Reilly attends a class reunion in England, the long-dead body of her former roommate turns up. Clues to the mystery follow Regan as she sails home--and into the hands of a killer.