Madeleine Tully lives in Cambridge, England, the World – a city of spires, Isaac Newton and Auntie’s Tea Shop.
Elliot Baranski lives in Bonfire, the Farms, the Kingdom of Cello – where seasons roam, the Butterfly Child sleeps in a glass jar, and bells warn of attacks from dangerous Colours.
They are worlds apart – until a crack opens up between them; a corner of white – the slim seam of a letter. Elliot begins to write to Madeleine, the Girl-in-the-World – a most dangerous thing to do, for suspected cracks must be reported and closed. But Elliot’s father has disappeared and Madeleine’s mother is sick. Can a stranger from another world help to unravel the mysteries in your own? Can Madeleine and Elliot find the missing pieces of themselves before it is too late?