in 1916, just before the russian revolution, Benjamin Kantarovitch, nicknamed "Mousy," has been asked by a sick friend to deliver a message to an agent in Prague. Believing he was undertaking an important mission under direct orders by Leon Trotsky, Mousy has left his shtetl near Odessa and traveled to revolutionary Prague to rendezvous with a secret agent. But on the way, Mousy loses the envelope containing the name of the agent he is supposed to...