Death on the Lusitania
(Book)

New York, 1915. RMS Lusitania, one of the world's most luxurious ocean liners, departs for war-torn Europe. Among those on board is Patrick Gallagher, a civil servant in His Majesty's government tasked with escorting a British diplomat back to England. When a fellow passenger is believed to have shot himself in his cabin, Gallagher is asked by the captain to investigate the scene - but one crucial detail doesn't fit. The man's body was discovered in a locked cabin with the key inside and no gun to be found. Was it really suicide? Or murder? Gallagher believes one of the passengers is a deadly killer, one who could strike again at any moment. And all the while, the ship sails on towards Europe, where enemy submarines patrol dark waters.