On the Seine, the Vikings attack with considerable force but can they breach Rollo's defenses? Meanwhile, Harbard, the mysterious wanderer, returns and causes a stir amongst the women of Kattegat.
The Vikings call Ragnar's leadership into question. Ragnar himself remains inscrutable and orders the fleet to beach at a cliff face where he unveils an ingenious plan. Rollo and Gisla have news that strengthens Rollo's position at the French Court.
The labours of the Vikings bear fruit as, within sight of Paris, they re-launch their fleet but this time with some formidable new structures that Floki has engineered. Aethelwulf and Alfred arrive in Rome and honours are conferred by Pope Leo. Relations are not so cordial in Wessex.
A fierce battle between the Vikings and the French eventually comes down to Ragnar against Rollo and the outcome seals the fates of the two brothers.
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