Rawhide and Ransom by Jo Grafford

Lonestar Security’s toughest bodyguard discovers a half-starved runaway hiding in his workshop — a teen who insists the woman pretending to be her mother is an imposter, and her real mother is missing.
Few people would guess Hawk Chesney is a family man at heart. The only reason he’s still single is because he’s never met “the one.” The moment he discovers a spitfire eighteen-year-old trespassing on his property, however, his heart goes into father bear mode. He promises to help locate her missing single mom.
Annalee Gilbert has been in hiding since the hit-and-run accident that put her in a coma. By the time she awakes, a woman who closely resembles her has hijacked her identity. Her only link to her old life is a mysterious note stating her life has been taken as a ransom. She has no idea what it means, but she intends to find out and do whatever it takes to get her family back.