Fractured Memory

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

United States marshal Eli Cayne saved Julia Galloway's life once…and he's prepared to do it again. But his task would be easier if she could remember him—or the murderer who almost put her in an early grave and seems to be hunting her once more. To protect Julia from the latest threat against her life, Eli has to consider the possibility that he put an innocent man in jail. Julia has no memories of the serial killer called the Hangman, though, and no reason to trust Eli. But with the killer getting closer, she must work with Eli to confront her past—and the feelings growing between them.