Under the Lawman's Protection

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
A PROMISE TO PROTECT 

As a skilled SWAT team negotiator, Isaac Morrison has defused many a crisis situation. But safeguarding Leah Nichols and her young son may be his most challenging mission yet. Leah's brother—his best friend Shane—has gone missing while working undercover. Now it's up to Isaac to protect mother and child from Shane's enemies. He doesn't know whom they can trust, but he's determined to catch the gunmen threatening their lives. Isaac knows he needs his best protection skills against their formidable adversary. Because he can't risk the consequences to the little family who has stealthily claimed his heart. 

SWAT: Top Cops:  Love in the line of duty