In Heat — Kate Hill

With her memory erased, Erica is caught between two men -- a handsome doctor who claims to be her boyfriend and a sexy government agent who suspects them of murder. She must rely on instinct to decide who to trust.

Suffering from a fever that can be broken only by sexual release, Erica soon learns that neither she nor the doctor belong on Earth. Passion flares between the visitors and the agent who has discovered them, but will he endanger their lives or save them?