Embarking on a Mystery Seminar cruise during the holiday season, amateur sleuth Alvirah, private detective Regan, and their family members find their voyage overshadowed by a ghost spotting, the disappearance of a fan, and an unexpected storm.

Regan Reilly is in New York to attend a crime conference organized by her celebrity-author mother. A friend, Thomas Pilsner -- the frenetic president of the Settlers' Club on Gramercy Park -- calls Regan, desperately pleading for help. Thomas is distraught over the sudden suspicious deaths of two members of the Settler's Club. The men had promised to donate a cache of valuable diamonds to save the Club. But now the diamonds re gone, the men are dead,...