Who are the Twindicate? What do they want? And can Si the Spy stop their dastardly plans in time? Usborne`s classic spy hero returns in a new adventure! Look out for him in a crowded train station, a thronging carnival, a shopping mall, a science lab and of course a secret underground villain lair. As well as spotting our hero on every page, he`ll need your help cracking codes, solving puzzles and unravelling fiendish conundrums to get to the bottom of an international crime conspiracy.