Briar's book
Circle of Magic 4 (Circle Of Magic)
by Tamora Pierce · 1999

Popularity 68
Briar, a young mage-in-training, and his teacher Rosethorn must use their magic to fight a deadly plague that is ravaging Summersea.
MagicFictionFantasyJuvenile fictionFriendshipChildren's fictionMagic, fictionFantasy fictionWinding circle temple (imaginary place), fictionPlague, fictionTeachersEpidemics