Hidden Star - Nora Roberts

She couldn't remember a thing, not even who she was. But it was clear Bailey James was in trouble. Big trouble! And she desperately needed Cade Parris to help her live long enough to find out just what kind.
The moment the cool-headed private eye laid eyes on the fragile beauty, she almost had him forgetting who he was. If Bailey was a criminal, Cade would eat his hat. But what was she doing with a satchel full of cash and a diamond as big as a baby's fist? And how could he unravel this mystery if he kept tripping over his heart?