The Crimson Spell

The Crimson Spell by F. Goldsborough. paperback edition. ISBN: 9780671041649.

Evil thoughts and dark desires Boil and burn in a wicked brew! Throw bate and fear into the fire -- May friends and lovers both be true! Prue, Piper, and Phoebe dont know that a coven of warlocks is hunting them. They dont know that one of the warlocks has entered their lives disguised as a friend. And they dont know the covens mission -- to drain them of their magical powers, even if it means destroying them to do it! Now the Charmed Ones must figure out which of their friends is really their enemy. Because sometimes what you dont know--can kill you.