It’s 1929, and twelve-year-old Martha’s troublemaking ways have gotten her kicked out of school. She has no choice but to join her mother and work in the kitchen for the wealthy Sewell family. Everyone says that heiress Rose Sewell is crazy, and Martha agrees - until she realises that Rose, an eccentric who refuses to leave her room, may be trying to communicate with the outside world through the paintings she sends down to the main floor of the house. If Martha’s right, then Rose isn’t a hermit - she’s being kept prisoner in her own home. But by whom…and why? In a household filled with secrets, the answers are not always clear, and no one is quite who they say. It’s up to Martha to figure out the truth in order to save Rose, her family - and herself.