Two orphaned Irish siblings take jobs at a crumbling English manor where sorrow and strange magic fester; an enigmatic night gardener appears with offers that grant wishes but demand a terrible price, remaking people and memories into uncanny topiary. As the household unravels under the gardener’s influence, the children must rely on courage, quick thinking, and the power of stories and loyalty to expose the house’s dark bargain and fight to save themselves and those they love.