Accompanying her employer, the new married Richenda Stapleford and her husband Hans Muller, on what is supposed to be a luxurious tour of the United States and Europe, Euphemia is returning from a visit to New York on April 12th on the RMS Carpathia, when an emergency signal sends the ship rushing to the aid of the sinking RMS Titanic.
By the time the Carpathia arrives the Titanic has sink beneath the waves. Euphemia and Richenda give up their cabins and do what they can to aid the survivors who are pulled from the few lifeboats. Not long after their arrival a personal wire is sent to Euphemia from a government department asking her to confirm whether or not the enigmatic spy Fitzroy is among the survivors. He is not.
Deeply troubled by what they have seen both women ask Hans to curtail the tour until a later date and return to the Mullers' home. Euphemia, still haunted by dreams of the grief stricken survivors, believes that her links with the Fitzroy's secretive department are now cut. Then a letter arrives from the man himself headed In the Event of My Death. It sends Euphemia off on a whirlwind of adventures and reveals secrets about Fitzroy that she could never have imagined.