Dave takes a wolf cub as company for the summer when his brother is away, and he calls it Robinson Crusoe. Fur thieves have raided trappers' cabins and Dave thinks the wolf will warn him if they appear by his cabin.; Three jailbirds have held up the store and stolen money, weapons and clothes. They left behind their jail clothes, and that was their blunder. Now Yukon King has a scent to follow.; The Graysons are held in captivity by a man who will force them to take him to their gold strike. Mrs. Grayson manages to escape and is found by Preston.; Gray Wolf snatches a rabbit from a hunting weasel.