“Masquerade” by Gayle Lynds

When you gaze into the mirror—and find a stranger looking back? Liz Sansborough has no recollection of her past as a CIA agent; no idea what her future holds. For her, there is only the present…and the chilling knowledge that the world’s most lethal assassin has set his sights on her.
When your only link to your identity is a stranger who claim to be lover? Gordon is so gentle, so loving—and so secretive. If Liz dares to put her life into his powerful hands, will he guard it with his own—or snuff it out?
When violence explodes around you, when nothing makes sense, when nobody—including you—is whom he or she appears to be? As Liz unravels a series of lies, she begins to suspect that the truth she encounters might be far more sinister—and deadly—than the original deception…