Owen and Eleanor move in
(Book)

When eight-year-old Eleanor moves into the bottom half of a duplex with her family, she is not happy. Her old home was way better. In her old home, she even had her own bedroom. Not any more--now she has to share with her big sister. The situation needs to change, and she knows just how to fix it. When Owen, age seven, meets Eleanor, he's excited--finally, someone to play with who isn't his little brother! He teaches her how to fence and write in code, and she helps him build mechanical gadgets and thinks his homeschooling is cool. But when Eleanor asks Owen to help her escape back to her old house, he's not sure he should do it.... What should a friend do? -- from Amazon.