The Crystal Throne - Kathryn Sullivan - Bog

Peter Burns doesn't believe in magic, but when horses talk to you and a witch hound swoops out of the sky, how long can you disbelieve?
Jeanne Tucker believes in magic, but she's teamed with someone who'd rather examine the special effects.
The two friends must learn to work together in order to defeat a trio of evil witches and unravel a curse that has enslaved an entire land.