Major Eva Rostova is a decorated combat surgeon, a master of saving lives in the “golden hour” amidst the chaos of a 21st-century battlefield. Her life is one of sterile procedure, advanced trauma care, and the relentless ticking of the clock. When the Black Hawk helicopter carrying her to a mass casualty event in Afghanistan is shot down, her life ends in a firestorm of rotor blades and desert sand. She awakens with a gasp to the thunder of cannon fire, no longer a respected Major, but a terrified, young Union Army hospital steward named Elias Kane on the first day of the Battle of Gettysburg, 1863. Plunged into the brutal, septic horror of Civil War medicine, where speed is valued over skill and infection is a greater killer than any bullet, Elias must use Eva’s future knowledge to fight a new war. His enemies are not just musket balls and cannon shot, but the deeply entrenched, deadly ignorance of his own side. His attempts to introduce radical ideas like sanitation, triage, and modern surgical techniques are seen as the ramblings of a madman. He must navigate the bloody chaos of America’s deadliest battle, guided by a ghost of a surgeon from the future, in a desperate attempt to save lives that history has already marked for death.