Smith and Petrie are remaining on Brownlow Wilton's yacht the Silver Heels are locked in a cabin supposedly unconscious as a result of drugged liquor they Favier has given them. Convinced that Smith and Petrie are disabled Favier proceeds to dynamite the ship however Smith and Petrie effect their escape in a row boat. They leave Venice to go to Paris . Traveling in a fast car they wind their way through a treacherous mountain pass as Favier and an assistant attempt to stop them by hurling a boulder down a cliff in to the road...