Double Agent

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
DANGER IS HER ALIAS 

As a spy, Sabine Laduca works alone. But when she investigates her brother's murder, she's forced into an uneasy alliance with his Delta Force team leader. The CIA taught Sabine to trust no one, and Sergeant Major Doug Richardson is no exception. The handsome soldier hides his own secrets, but nothing will stop Sabine from finding out who killed her brother. Not even when the CIA declares her rogue. Now not only is the killer after her, so is the agency. For the first time, she needs someone—Doug. Because only he can help her find the truth…and only he can keep her safe….