A Bess Crawford Mystery. The critically acclaimed, New York Times bestselling author of the Ian Rutledge mystery series, Charles Todd once again spotlights World War I nurse Bess Crawford in An Unmarked Grave. Gripping, powerful, and evocative, this superb mystery masterwork unfolds during the deadly Spanish Influenza pandemic of 1918, as Bess discovers the body of a murdered British officer among the many dead and sets out to unmask a craven killer.