Agar set up a small base at Terijoki, just inside Finland and close to the Soviet frontier. From here he undertook a top secret and dangerous mission to retrieve Paul Dukes, a man he knew only by the MI6 codename ST-25, from the coast of the Bay of Petrograd. The last British agent left in Russia, Dukes had been infiltrating the Bolshevik government for some time and had made copies of top secret documents. A master of disguise, he was known as "The Man with A Hundred Faces", but his resources had run out by this time. In order to spirit Dukes away, Agar's boats had to cross Bolshevik minefields and pass by a number of forts and ships guarding the entrance to the Bolshevik naval base at Kronstadt and to Petrograd, now St. Petersburg.