When Sally is clawed during a game in gym class, she starts to experience the symptoms of a fatal disease. When clues lead the trio to believe Ann may be responsible for the infliction, they set out to break into Shadowmire to find an antidote.

After a supernatural were-cat begins to terrorize Spooksville, Sally is found transformed into a kitten. Adam and Watch seek help from Ann to conjure up a spell to save their friend from being a feline forever.