"Charlotte Holmes's brilliant mind and deductive skills are pulled into a dangerous investigation at sea in the new mystery in the bestselling Lady Sherlock series. After feigning her own death in Cornwall to escape from Moriarty's perilous attention, Charlotte Holmes goes into hiding. But then she receives a tempting offer: Find a dossier the crown is desperately seeking, and she might be able to go back to a normal life. Her search leads her aboard...

In 1932, the RMS Aquitania embodies all that is gracious and refined, in a world gripped by crisis and doubt. Returning home on the luxury liner after months abroad, Rowland Sinclair and his companions dine with a suffragette, a Bishop and a retired World Prophet. The Church encounters less orthodox religion in the Aquitania's chandeliered ballroom, where men of God rub shoulders with mystics in dinner suits. The elegant atmosphere on board is charged...

In the 1920s, the dentist Walter Baranov and his lover murder his wife and flee on the luxury liner Mauretania, but when a murder occurs on board the ship, Baranor's alias of Scotland Yard Inspector Dew makes him the logical investigator of the crime.

Fleeing a disastrous and humiliating arrest of her husband-to-be on the eve of their wedding, Celia Kilbride, a gems and jewelry expert, hopes to escape from public attention by lecturing on a brand-new cruise ship-the Queen Charlotte. On board she meets eighty-six-year-old Lady Emily Haywood, "Lady Em," as she is known throughout the world. Immensely wealthy, Lady Em is the owner of a priceless emerald necklace that she intends to leave to the Smithsonian...

For young American widow Jane Wunderly, there are worse fates than adventuring aboard a transatlantic liner with the only man who could change her mind about romance. Unfortunately, her first-class itinerary has an unexpected--and deadly--addition waiting just below deck... Atlantic Ocean, 1926: Voyaging from Southampton to New York, self-reliant Jane is determined to prove herself a worthy investigator on the stately ship--even awkwardly going undercover...

"February 1939. Mamie Mason isn't enthusiastic when Bert, her husband of thirty years, persuades her to join him on an African cruise. Bert might be pining for adventure, but Mamie's perfectly content with her comfortable life in Hills Corners, Ohio. But once the couple board the glamorous SS Columbus, Mamie has to admit - much as it pains her - that Bert was right. Swimming in the pool, dancing under the stars, their own bedroom steward to serve...