Turn-of-the-century detective Isaac Bell matches wits with a German spy just as the world inches closer to global warfare in this novel in the #1 New York Times-bestselling series.

It's 1910 and Chief Investigator Isaac Bell, along with fellow Van Dorn detective, Archie Abbott, is escorting a Wall Street stock swindler to his trial in New York aboard the ocean liner Mauretania. Pair intend to enjoy the open sea and make use of the leisure time to plan Bell s wedding to Miss Marion Morgan, but are forced to change plans when two European scientists are...