Murder in Black Canyon

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
With a woman's life in jeopardy and a body found in the Colorado wilderness, an agent's homecoming is anything but smooth… 

When Kayla Larimer's investigation into a US senator's missing daughter leads her to a Colorado cult, a murdered FBI special agent and the Ranger Brigade's Dylan Holt, the fiercely independent private investigator is determined to ditch the sexy Black Canyon lieutenant and catch the criminals on her own. Dylan admires Kayla's stubborn dedication—even as his protective instincts kick into overdrive. But then a kidnapping attempt on Kayla coincides with the disappearance of the senator who hired her, and these two opposites must fight a faceless enemy—and their growing attraction—to bring a killer to justice. 

The Ranger Brigade: Family Secrets