Kirby's Dilemma by Iris Iglarsh

Kirby's Dilemma is a heart-warming story about a friendship between a ghost named Kirby Scott and an eleven-year-old boy named Michael Benton. After Michael and his family move into a vintage home near Chicago, he meets Kirby, who died in that house about seventy years earlier when he was eleven. Their growing friendship and shared sense of humor allows Michael to learn about Kirby's dilemma and his family's secrets. With the help of Michael's classmate, Vickie Vargas, they take on the biggest challenge of their lives to help Kirby solve his problem.