The Creed of the Assassins 4 (Unveiling the Secrets)

He's older, wiser, and more lethal than ever. Assassin Master Ezio Auditore embarks on an epic journey to find the lost Library of Altaïr. A library that may hold the key to defeating the Templars forever. But a startling revelation awaits him. The library not only holds hidden knowledge but also the most dangerous secret the world has ever known. A secret the Templars hope to use to control the fate of humanity. Five keys are essential to open the library. To find all five, Ezio must travel to the troubled city of Constantinople, where an army of Templars is gathering, threatening to destabilize the Ottoman Empire. Following in the footsteps of his predecessor Altaïr, Ezio must defeat the Templars one last time, for the stakes have never been higher. What seemed like a sacred quest has become a race against time.