Recently widowed Heung (Sylvia Chang) finds a mysterious key that her husband Bill (Simon Yam), one of Hong Kong’s premier neon sign artisans, left behind. The discovery reveals that Bill’s workshop, which she thought had been long shut down, is still running and inhabited by Bill's young apprentice. Together Heung and the apprentice set off to fulfill Bill’s dying wish: complete his magnum opus as a tribute to his life’s work. Heung’s mission not only acts as a salve for her grief but also allows for romantic flashbacks of her life with Bill as well as the heyday of the brightly lit signs that adorned Hong Kong in its most prosperous era. A Light Never Goes Out is a nostalgic lament for all of Hong Kong’s recent trials and tribulations as well as an illuminating paean to its irrepressibly bright and vibrant spirit.