Christmas in Hiding

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
CHRISTMAS IN WITNESS PROTECTION 

After her ex-boyfriend's murder, Callie Martin has no choice but to trade her quiet life as a kindergarten teacher for the witness protection program. It's US Marshal Jackson Walker's job to keep Callie safe, but the men who would do her harm just keep getting closer and closer. Either someone on the inside is betraying Callie, or she's lying to Jackson about her involvement. So he decides to go off the grid, spiriting her away to the remote Vermont countryside at Christmas. Jackson wants to trust her, but with danger dogging their every move, he'll have to use all his energy to keep her alive.