When Sabrina and her aunts visit the Rummage Realm, a giant flea market for witches, Sabrina comes home with a special purchase: wishdust. It's a glittery powder that parkles with all the colors of the rianbow and will grant any wish to the person who sprinkles it into the air. Now Sabrina won't have to waste her energy perfoming spells, since the powder will do the work for her.

But the wishdust isn't easy to contain--and it can be used by anyone, even a mortal. But before Sabrina realized it, the shimmering powder has spread all over school and evey student's wish list is coming true. As bizarre things spiral out of control, Mr. Kraft suspects that Sabrina is behind the mayhem. Can Sabrina dust off her magic skills and put an end to everyone's wishful thinking--before Mr. Kraft figures out what's really going on?