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.

A mesmerising story of two worlds; the cracks between them, the science that binds them and the colours that infuse them.

‘Perfectly strange, and absolutely comical and heartfelt ... Jaclyn Moriarty is one of the most original writers we have.’ – Markus Zusak