uke & Chester on a ship to Skagway, Alaska, find a map to a secret gold mine, which had been stolen by thugs, McGurk & Sperry. Meanwhile, Sal Van Hoyden is in Alaska to try and recover her fathers map. She falls in with Ace Larson, who wants to steal the gold mine for himself. Duke & Chester, McGurk & Sperry, Ace, his henchmen & Sal, chase each other all over the countryside, all after the map.

Overview from themoviedb.org