Few people know that near Kaliningrad, formerly Koenigsberg, there is a system of branched and well-fortified catacombs. But even fewer people know what the Nazis hid in these catacombs during the Second World War. Perhaps the traces of the famous Amber Room lead precisely to these dungeons. The next book of the successful Russian treasure hunter and traveler, writer Alexander Kosarev tells about all the vicissitudes of the intense competition between treasure hunters and intelligence officers in search of treasures.