In this fourth installment, New York Times bestselling author Zanetti mixes high-octane action with even more intense romantic tension as two misfit operatives in a secretive Homeland Defense department chase down a diabolical serial killer. Unswerving: Angus Force is determined to hunt down the serial killer he'd once shot dead--or so he thought. But an anonymous source reports that Lassiter is alive. Force hasn't slept since, knowing it's only a...