For the first time ever, Frank and Joe Hardy embark on an intriguing mystery on Nintendo DS. Traveling by train across Europe, Frank and Joe Hardy follow the mysterious trail of the Romanov family treasure through historic cities like Vienna, Paris, Prague, Warsaw, and St. Petersburg, trying to unlock the century old secret that surrounds the Romanov family. Things get decidedly mysterious on board the Royal Express as players explore train cars for clues, interview passengers and solve interactive puzzles as they hunt down the lost treasure.