Dream Snatcher by Sabine Kells

"Anna Stanfield has denied her psychic abilities for years. Then her younger sister is found in a coma, a victim of a psychic vampire. Now Anna must use her powers to help catch her sister's killer.

FBI agent Ian McGregory draws Anna into his investigation, knowing her strong psychic powers will draw out the killer he's been secretly tracking across the country—a killer who threatens to expose Ian and his people to the world. Ian knows that he must do anything, even sacrifice Anna, to ensure that his people and their secret remain safe.

But Ian hadn't counted on falling in love with Anna, and he knows his love for her will destroy them both." (From Amazon.com)

Paperback Info: ISBN 1893896765, Imajinn Books, 2002