Bailey School Kids #5 is called Ghosts Don't Eat Potato Chips. The premise is that Eddie's great aunt Mathilda is sick and dying. He has to deliver food to her for a few days, and there are multiple sightings of a shadowy figure. The figure saves everyone from a burning casserole, and eats some food. The kids suspect that it is the ghost of Mathilda's husband, Uncle Jasper.
Aunt Mathilda takes a turn for the worse, and she gets hospitalized. The kids chase the shadowy figure up to the attic, where they find Jasper's old hat. Hidden inside is a bunch of money. It pays for Aunt Mathilda's hospital bills, and months later, she's in great shape. The End.
This is a good book, mainly because Aunt Mathilda is interesting. She starts off as a mean old woman, but she becomes friendly around the other kids, and she teaches them poker. On the other hand, Eddie was a bigger jerk than usual. He constantly complained about his aunt, and he was mean to her the whole time.
The ghost stuff was mildly interesting. I think it hurt the book overall, because the ghost never talked or interacted with the kids. For all we know, the kids just saw random shadows. Or a homeless person is secretly living in the house, like in Nancy Drew: Message in a Haunted Mansion. It's kind of hard to have a book about a monster, when the monster doesn't actually appear.