Mystic (2000) #37

Babe Behind Bars! Giselle is held prisoner by her most insidious enemy ever: the super-secret Geometer Guild. This group, which has secretly controlled much of the history of planet Ciress for centuries, has discovered a way to render our mighty Mystic powerless. Without her magical might, does Giselle have what it takes to wind the day? And who is that mysterious cellmate of hers...?