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No one in the Border Patrol station in southern Arizona could recall precisely when they first heard the name Lena Hart. She arrived without fanfare, carrying only a duffel bag and the haunted look of someone who had seen too much. In hushed tones, some of her new colleagues referred to her as the Ghost Ranger, a nod to her silent demeanor and the fact that she could slip in and out of the station with little notice. Yet behind that distant gaze lay a history unlike any other.

Lena Hart had once been Sergeant Lena Hart of Delta Force, a highly skilled operative who had served tours in Afghanistan and Iraq. She was known for her unyielding focus under fire, her ability to adapt to impossible conditions, and a string of commendations that would make any officer proud. But the final mission she undertook overseas had gone terribly wrong. Betrayed from within, she watched her entire unit fall apart in a matter of hours. The survivors were few. Lena often wondered if it would have been kinder had she not been one of them.