Murder Under the Mistletoe

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

DEA agent Tyler Griffin must stop a drug cartel that's using an Idaho Christmas tree farm to smuggle narcotics across the Canadian border. But to do his job, Tyler needs the cooperation of farm owner and widowed mother Heather Larson-Randall—whose informant brother died on Tyler's watch. Tyler knows a crucial piece of evidence is hidden somewhere on the property. But getting the protective mother to trust him is the hardest part of his mission. As threats against Heather mount, he vows to keep her and her child safe…and clear the farm of danger before Christmas. 

Northern Border Patrol: Keeping the US-Canadian border safe..