The powerful Norwegian jarl Sigurd the Happy does not forgive anyone for betrayal - especially the despicable Angles. But their alderman dared to break the treaty of friendship and fled on a ship stolen from the Vikings, taking with him someone else’s booty! Sigurd and his “wolf pack” gave chase, and none of the English managed to escape. Among the alderman's belongings, the Vikings found an old book - a priceless Gospel worth a fortune. Then the cunning Raven invited his earl to sail to Paris, to the lands of the Frankish Emperor Charles, and sell him this book. And so that the formidable Christian ruler, known for his cruelty towards the pagans, would not deal with them - take with him a captive alderman, so that he would speak to Charles as a Christian to a Christian. The plan is very risky, but the Vikings - the sons of thunder - know no fear...