Join the Secret Seven, a group of young detectives, as they embark on their thrilling inaugural mission in the first installment of this world-popular series by Enid Blyton. In a wintry landscape, Jack stumbles upon a peculiar scene near the isolated Winter House, where an enigmatic caretaker resides. Fuelled by curiosity, the Seven don disguises and pursue the mysterious trail that leads them into the heart of a perplexing puzzle.