In the time-honoured Hermitage of St. Petersburg three precious paintings have been substituted by valueless copies. At first it appears to be just a normal art robbery, but Colonel Ostankovic, head of the art robbery department in St. Petersburg, thinks otherwise - he suspects a mysterious secret society behind it. The game Memento Mori refers to the relatively unknown fraternity of the same name. Their prime objective is keeping certain paintings in secret; therefore they stash artworks away for hundreds of years. Colonel Ostankovic knows this and raises an alarm. He assigns the case to Larisa Ivanovna Svetlova, one of his best colleagues. Larisa contacts Maxim Durand as a 'helping hand'. He is a former counterfeiter with numerous, valuable connections in the art scene. In the new adventure game, Memento Mori, two playable protagonists await the player. The player's goal is to solve the secrets of the art robbery, the mysterious secret society and its intrigues.