Revenge of the Invisible Boy (Goosebumps SlappyWorld, Bk. 9)

Magic Club is supposed to be fun for Frankie Miller and his friends. But that pest, Ari Goodwyn, is always ruining everyone's tricks. After a really embarrassing fail, Frankie wants revenge. When the legendary magician, Mystical Marvin, comes to town to perform his daring stunts, Frankie sees an opportunity to get even with Ari. There's only one problem: Everything goes wrong. Can Frankie and his friends make things right? Or will the opportunity disappear . . . forever?