Every night, after Wilson and Willa close their eyes and drift off to sleep, a secret band of heroes awakens in their bedroom. Sir Buttons the teddy bear, Princess Millicent the doll, Megotron the action figure, and Duckie the stuffed monkey are the Night-Night Knights, loyal guardians sworn to protect the twins from the dangers that lurk in the darkness. While the children dream peacefully, the Knights stand watch against Boogey Men, monsters lurking under the bed, and monsters hiding in the closet.But far beyond the bedroom walls lies the Dark, a shadowy realm ruled by Umbro, the fearsome Bogey King. Determined to make Wilson and Willa his prisoners, Umbro unleashes his army of monsters in a daring plot to kidnap the twins and drag them into his nightmare kingdom forever. To save the children they love, the Night-Night Knights must embark on their greatest adventure yet - a thrilling journey filled with courage, friendship, magic, and the power of hope.