Davy, a working-class boy living in East Belfast in 1908, is sent to work at the wealthy Lewis household. When he meets Jacks – the name by which CS Lewis was known to friends and family – Davy is captivated by his friend’s world of books and stories. Together the boys plunge into imagining and adventuring, and Davy discovers his own artistic talent. But when Davy is offered a job at the shipyard, and Jacks’s mother falls gravely ill, their wondrous days of make-believe seem numbered. Will they lose their extraordinary shared world forever?