Monsters, Inc.: Laugh Factory (2009) #4

(W) Paul Benjamin (A) Amy Mebberson Sully, Mike, and Celia discover a rash of robberies targeting Boo and other kids. As the little girl and her monster friends investigate, they learn that the thief is a human teen who's been using the closet doors at Monsters, Inc. to slip in and out of the homes! Can they stop him without having the human world and Monsteropolis collide?