Christmas Undercover

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

FBI agent Sara Vaughn believes a group of pharmaceutical businessmen are engineering drugs with deadly results. Her boss won't approve a sting operation, so she goes rogue—following the suspects on a hike in the Cascade Mountains to record evidence. But when Sara witnesses them murder one of their own, they target her. Saved by a handsome volunteer mountain rescue worker, Sara at first suspects Will Rankin is another bad guy hunting her. But when the widowed father of two risks everything to save her, she knows that Will is all that's standing between her and seeing Christmas morning. 

Echo Mountain: Saving lives and finding love in the mountains of Washington State