The Mystery of the Outlaw's Horse [Large Adventures of the Incredible Smalls #17]

Meghan and Georgina befriend an old man shunned as the town drunk. They discover he is an expert on horses. But as they try to help him they discover he has ghosts in his closet. They determine to find out what is haunting the old man and then they get into the past and find the mystery of a bank robbery in a small town called Furnace Cliffs, Kansas.