Bluebeard's Last Stand — Alistair Boyle

The luxury cruise to New Zealand is all set for the lovebirds when mega-priced, contingency private investigator Gil Yates gets the urgent call. Frantic that his aging mother and her suspicious younger boyfriend may marry at sea, stripping him of his "rightful inheritance", Harvey pleads for Yates's help. A more pressing fact: The beau in question has four dead wives in his sordid past. Gil jumps on board, simultaneously enjoying the opulence of the cruise and striving to keep it from becoming a fatal one.