It's a new school year at Monster High, and the little sister of Clawdeen Wolf, Howleen, is determined to be more fangtastic than ever. Her dream of popularity turns out to be easier than anyone imagined when she stumbles upon a genie named Gigi Grant who grants her not three, but thirteen wishes. The ghouls quickly learn to be scareful what you wish for, because each wish comes with a dark side, and soon the student disem-body of Monster High is turned upside-down.