Captain Underpants's spookiest--and stretchiest--adventure yet! George Beard and Harold Hutchins are back in a new Halloween adventure! Piqua's biggest pranksters are getting ready for the best holiday ever--Halloween, of course. But their dreams of costumes, candy, and haunted houses go down the drain when Mr. Krupp and Melvin start a campaign to make Halloween illegal! That's when George and Harold come up with HACK-A-WEEN, a totally legal spin-off...

Mary Anne should never have thrown away that chain letter she got in the mail. Ever since she did, bad things have been happening to everyone in the Baby-sitters Club. With Halloween coming up, Mary Anne's even more worried -- what kind of spooky thing will happen next? Then Mary Anne finds a new note in her mailbox: Wear this bad-luck charm, it says. OR ELSE. Mary Anne has to follow the note's instructions. But who sent the charm? And why did they...