All the Lovely bad Ones-By Mary Downing Hahn

My book is about two kids named Corey and Travis who stay with their grandmother at her inn for the summer. They learn that the inn may be haunted. For people who were intresting, and othes to believe Corey tells her brother Travis her idea of dressing up as a ghost and tring to get fammous for it. Their grandmother is a total skeptic in ghost and tells Corey and Travis to stop talking about it to the tourists. They eventally gets ended up having psychics coming to the Inn which triggered the "real" ghosts to start trouble, who are only kids. Will Corey and Travis help them get peace?