A hanging at dawn / Charles Todd.

Years before the Great War summoned Bess Crawford to serve as a battlefield nurse, the indomitable heroine spent her childhood in India under the watchful eye of her friend and confidant, the young soldier Simon Brandon. The two formed an inseparable bond on the dangerous Northwest Frontier where her father's Regiment held the Khyber Pass against all intruders. It was Simon who taught Bess to ride and shoot, escorted her to the bazaars and the Maharani's Palace, and did his best to keep her out of trouble, after the Crawford family took an interest in the tall, angry boy with a mysterious past. But the Crawfords have long guarded secrets for Simon and he owes them a debt that runs deeper than Bess could ever know. Told through the eyes of Melinda, Richard, Clarissa, and Bess, A Hanging at Dawn pieces together a mystery at the center of Bess's family that will irrevocably change the course of her future.