The Spell-bound Scholar
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The third book in the Heirs to the Warlock series by Christopher Stasheff, published in 1999.
From the Publisher:
"In this first 'Warlock' novel in years, the adventures of the Gallowglass family continue with the youngest son, Gregory. This most eligible bachelor with a true heart is an ultimate challenge for the family's nemesis, Moraga. Through her spells, she will bring him under her power."