The story: The Blair family has recently moved to the country from Detroit. Dad and Mom had to go back to the city for a few days so they left the four kids to take care of things at the new house. The oldest sister is college-age, so that’s okay. 

Their very first night alone in the house, the two boys hear a noise in the attic that needs to be investigated. Hollis, the oldest boy, maybe twelve years old, wants so badly to have a mystery to solve that everyone assumes he’s making a big deal out of nothing.

https://plumfieldmoms.com/plumfield-moms-picture-book-reviews/who-walks-the-attic