Hattie Maxwell is trying to make sense of her life since the Big Split. It used to be the four of them – Mum, Dad, Ivy and Hattie – against the universe. But lately it feels like she’s a lone star in a big galaxy. Her one escape is Hummingbird House, an old mansion with a giant mulberry tree just perfect for climbing to hide from the world.
So when Hattie learns that the house is going to be demolished, she is determined to save it. A midnight visit becomes a step back in time, and Hummingbird House reveals its secrets: a hidden library, a mysterious new friend, and a lost treasure that could help stop the development. Can the past help Hattie to fix her present?