While visiting New York's Yankee Stadium with Kate's mother, cousins Mike and Kate decide to investigate the rumor that the ghost of Babe Ruth is haunting the stadium.
Alexander, in North Carolina while his father decides whether to remarry and move there, meets the ghost of a Confederate soldier and helps him look for his family.
When his family moves to a small town near Milwaukee, Matt's efforts to fit into his new fourth-grade class are complicated by his poor spelling and his encounter with the ghost of one of the school's former teachers.
Having trespassed and explored the empty Hutchinson mansion, which seems haunted by the presence of a long-dead young girl, sixth grader Neely and her little brother become regular visitors when emotionally disturbed Curtis Hutchinson moves in.
Humphrey, a small ghost, enlists the help of Rick, a sympathetic schoolboy, in finding a solution to the growing problem of homeless ghosts--those who have lost the houses they have been haunting to highways and other modern "improvements.".
After he is killed in a tornado, Gabe does not realize at first that he is dead, but when he finds himself still with ties to the living, he realizes that his mission in the afterlife is to help others before they cross over into the light.
