Constable Winter is bringing in the outlaw, Gunnison, when he is shot from the bush and knocked off his horse. He goes over the rim into the river, but is rescued by Preston and his dog. Now Preston sets out after the outlaws.; The mail team has fell off the trail and is found by two bush tramps. They search the mail for valuables and find a letter about a rich gold struck by Ross Mabry. He wants Preston to escort him to town with his gold. Now they are going to pay Mr. Mabry a visit.; Old Will has broken his leg and gets short on rations, so he sends away his dogs to feed themselves. One gets into town and Youkon King is following his tracks back to Will to save him.; Gray Wolf encounters a savage and ever hungry wolverine.