After the disappearance of their parents, fourteen-year-old Molly and her younger brother Kip are left to take care of themselves. They flee from their native Ireland during the Great Potato Famine and arrive in England, where they find themselves penniless and homeless. Desperate to find jobs and a place to live, Molly and Kip seek employment as servants at the Windsor house despite the many warnings that the local townspeople give them. Upon entering the estate, they immediately sense that something isn’t quite right. The house is eerie and dark, a creepy twisted old tree grows alongside the house, and the Windsor family is strange and unnaturally pale. Soon Molly and Kip discover that the estate is haunted by the Night Gardener, a spirit who grants wishes but also feeds off the souls of those who inhabit the house. Together, Molly and Kip must overcome the powers the spirit holds over them and come to accept the truths of their past.