Richard Hannay (Rupert Penry-Jones) has his holiday interrupted when secret agent Scudder (Eddie Marsan) bursts into his apartment, staying alive just long enough to deposit a notebook. Pegged with murder, Hannay must decode the book and nab the culprits -- before they find him first. In this nimble BBC update of John Buchan's novel, German spies and British police give chase as Hannay races to deliver the coveted code and avert a world war.