“The Glass Ocean” by Beatriz Williams is a “seamlessly narrated” story about two American women aboard for the last voyage of the liner Lusitania, which was torpedoed by a German U-boat in 1915. One is an unhappy wife accompanying her distant husband, the other, a grafter seeking to make a score off her fellow passenger.  Their intertwined fates are discovered an historian a century later.  This is “an absorbing tale interlaced with espionage, secrets, and romance” (Library Journal).  For the actual story of the Lusitania sinking, we recommend “Last Wake” by Eric Larsen.