The Circle Opens is a quartet of
novels written by
Tamora Pierce and set in a pseudo-medieval/renaissance era. It mainly revolves around four teenage mages, each specializing in a different kind of magic, as they find that they are forced to deal with mages whose powers are similarly unusual to their own. The
Circle Opens Quartet is the sequel quartet to
The Circle Of Magic Quartet, and is followed by
The Will of the Empress.