On a luxurious transatlantic ship sailing through mysterious waters, a group of seemingly ordinary passengers becomes embroiled in a series of unsettling events. When a valuable jewel disappears in the midst of the voyage, tensions rise and panic begins to spread among the occupants of the ship. Among them are a cunning private detective, a young adventurer in search of thrills, and an enigmatic aristocrat with a dark secret.
As the ship's lights shimmer in the night and the murmur of the ocean serves as the backdrop to the intrigue, each character starts to unveil their own mysteries. The young adventurer, with fierce determination, teams up with the detective to solve the murder that has also shaken the vessel. As hours pass, the evidence points toward an unsuspected culprit, and the atmosphere becomes increasingly tense.
The enigma deepens when a new passenger boards, a traveler who brings more questions than answers. Amid witty dialogues and unexpected twists, the situation escalates, leading the characters to an electrifying climax where loyalty and betrayal intertwine. Set against a backdrop of glamour and danger, this black-and-white film is a blend of comedy and suspense that keeps you on the edge of your seat as the true face of the mystery and those involved is revealed.