The Littlest Witness

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

When Delta Force soldier Caleb Judd's brother and sister-in-law are murdered, the killers turn their attention on his orphaned nephew. Caleb's new mission: protect little Tommywho hasn't said a word since witnessing his parents' deathsand figure out who's targeting his family. He needs help, and security expert Shelley Rabb is perfect for the job. But Caleb's used to calling the shots, not taking orderseven when they come from a beautiful former Secret Service agent. Shelley knows firsthand what can happen when business becomes personal, so she vows not to get too close to Caleb and his nephew. She will risk her life to make sure they're safe, but will that mean risking her heart, too?