Horror Hotel II: Ghost in the Guest Room (Ghosts of Fear Street #35) by R.L. Stine - Vintage Paperback

A strange spirit from the past is haunting Joe and his grandfather at the Horror Hotel. Good thing the two of them found a spell that will get rid of the ghost. But that is not all the spell does. It also makes Joe and his grandfather switch bodies!

Can Joe get back in the right body before he becomes the oldest looking eleven-year-old in history?