Colby Agency investigator Levi Stark had been prepared for the worst when his boss sent him to find her agency's deadliest enemy. But deep undercover in a Mexican mining outpost, Levi met danger from the unlikeliest source–an unknown blonde spitfire on the same trail. Casey Manning had been secretly sent by Levi's boss's husband. The benched CIA agent trusted no one and worked alone...until she and Levi found themselves outmanned and outgunned. Around her sexy new partner, Casey had a feeling that protecting her identity–and her heart–would prove tougher than keeping them safe from the Colbys' most wanted....