The Circle Of Three reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)
Circle Of Three is a book series consisting of 15 books written by Isobel Bird about 3 girls, a "nerd", a "rebel", and a "prep", who find each other and become best friends through the accidental introduction of the prep to Witchcraft also known as the religion of Wicca.