"When I'm faced with a Pilkey fan looking to branch out, this graphic novel is the first book I reach for... If eight books aren't enough, the spinoff series, Agents of S.U.I.T., continues the fun." ―The New York Times More than four million copies in print! InvestiGators fans, get ready to dive into the third volume of Agents of S.U.I.T. with the weirdest mystery yet! New S.U.I.T. recruit Zeb the sheep joins the flock to help crack the greatest mystery of all! But, uhh...just what is the greatest mystery of all? That's the question that's kept the dearly departed General Inspectre haunting Earth long after he should have moved on to the great super-spy base in the sky. Having a ghost in the halls of S.U.I.T. wouldn't be so bad...except he's possessing agents! Zeb -- along with Cilantro, Bongo, Marsha, and everyone's favorite Gators -- must decipher the series' biggest mystery EVER. They've got to free their pal and finish the Inspectre's unfinished business!