Unknown Enemy

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
THE BODYGUARD 

For professor Ginny Anderson, translating a set of ancient tablets could be the coup of her career—or more danger than she can handle. Someone doesn't want the secrets of the artifacts to be revealed…and they'll kill to bury her discoveries. But former Secret Service agent Colin Tapping refuses to let anybody hurt Ginny and appoints himself as her protector—whether she wants one or not. Colin has made mistakes in the past, and keeping Ginny safe could be just what he needs to prove he's still a capable agent and win back his job. But is he willing to risk paying the ultimate price to reclaim his former life?