Eye of the Fortuneteller is a novella written by R. L. Stine and Casey Daniels writing as "Connie Laux". It was first published in 1996 and is the seventh book in the Ghosts of Fear Street book series.
Description[]
Mike loves hanging out in his father's weird little museum on Fear Street. It's full of cool stuff -- a guillotine, a mummy, a bunch of spooky wax figures. Mike's favorite is a suit of armor. At least it was his favorite until he saw a pair of glowing eyes inside the helmet. Until the knight lifted its arm and pointed its sword at Mike's chest. Until the knight challenged Mike to a battle. A battle to the death.