An old and rheumatic man, (Bicknell) comes to the Cool & Lam agency seeking help for a young woman Mira Woolford) who is being blackmailed. Mira had married his partner and when the partner died, she inherited half of his substantial estate. His death was sudden, so there is some suspicion as to the cause. Mira is in Hawaii, so Bicknell hires Bertha and Donald to travel with him to the islands on a deluxe cruise ship.

An amateur photographer is killed, and the beautiful young model he was capturing in the eye of his camera disappears. Perry Mason and his crew try to solve the mystery before it becomes a case of murder-by-month.