Evade and Capture (Callahan Security #4)
Lori Matthews

Searching for his sister has been a driving force for businessman and multimillionaire Jameson Drake. When a woman approaches him out of the blue claiming to know where his sister is, he has no choice but to go along. He’d imagined all kinds of wild theories about what happened to Kathleen but the truth is more shocking than even he’d ever guessed.
Forced to work together to keep Kathleen safe, Spencer strikes an uneasy alliance with Drake, wavering between wanting to shoot him, and needing to kiss him. Other than their mutual attraction, the one thing they do have in common is their desire to keep Kathleen safe. If only the mob didn’t have a different agenda.