Detective Sherlock Holmes and his partner, John Watson, receive tickets for the Titanic as compensation for one of their cases. They board the ill-fated ship, hoping to see what further adventures lie in store for them in America.
Molly Hooper is traveling with her mother and fiance, Lord James Moriarty. She dreads the day they finally arrive in New York City, as she is due to be married soon after. She wishes to one day become a doctor, but fears her new husband will not allow his wife to pursue her intellectual dreams.
Circumstances bring Sherlock and Molly into contact with each other. Sherlock is drawn to her sharp and scientific mind, and Sherlock’s straightforward manner and blinding intelligence are a breath of fresh air to the sheltered young woman. They grow closer, Molly much preferring his company to that of her callous fiance.
Eventually the ship hits an iceberg, it sinks, etc., etc. (come on, you all know this part already). Sherlock and Molly go into the water together, but they put their brilliant heads together and figure out a way to fit both of their bodies on a floating door so they can survive. They get rescued and live happily ever after.