"Verses written to the tune of The Ants Go Marching describe an ever-increasing parade of ghosts, witches, and other spooky creatures as they haunt a school on Halloween"--Provided by publisher.
Slip-sliding his way through a haunted house, a little ghost is joined by a shuffling mummy, a happy little monster, and other ghoulish friends before discovering the scariest creature in the house.
Two days after Marvin sees a glowing green thing like a flying birthday cake in the night sky, his third-grade class is joined by a mysterious new boy with peculiar behavior.