When one of their friends is captured and sold into slavery in the land of the Rus, the children of the old chieftain and their comrades decide to risk everything to rescue him. Little do they know what awaits them when they embark on the Viking ship, the Eagle. In addition to the dangers of the sea voyage, they must face the villainy of a traitor, marauding pirates and robbers, before they end up in a seemingly hopeless situation as slaves in a quarry. To add to their problems, they learn that they have provoked the anger of the new chieftain of their island home and have been banished.