Entry to Valhalla eludes Ragnar but as he lies in his sick bed in Kattegat events unfold beyond his control. Bjorn orders the arrest of Floki for Athelstan's murder and in Paris, Rollo betrays his allies to strengthen his position. Meanwhile, in Hedeby, Kalf announces joint Earldom with Lagertha, but is Lagertha actually willing to share what once was hers?
Floki hopes to escape from Ragnar and Kattegat. Rollo makes great efforts in Paris to win over his new bride, Princess Gisla. King Ecbert orders his son Aethelwulf to rescue Queen Kwenthrith from opposing forces in Mercia.
Floki faces the wrath of Ragnar. Intrigue prevails in the French Court as Rollo finds an unlikely ally. Kalf and Erlendur plot their ascent. Bjorn must fight a fierce opponent in the wilderness.
The Yule Log burns in the Great Hall in Kattegat and mysterious visitors are welcomed, among them a Norwegian King. King Aelle visits Wessex for Christmas and is concerned with how family relations are developing. In Paris, Rollo's future hangs in the balance - can he win over his new bride, Gisla, as a Papal Delegation arrives to arrange a divorce?
There's an air of betrayal at Court in Paris and in Wessex. Ecbert agrees to support Kwenthrith in Mercia, but is Ecbert a true ally? Ragnar confides in Yidu his darkest secret. Happiness comes to Lagertha and Kalf and a marriage is arranged.
Ragnar announces a raid on Paris at the Thing in Kattegat. The fleet is battered by a storm after it sets sail, but the greatest challenge for the Vikings lies ahead in Paris, where Rollo awaits. Meanwhile, Ecbert dispatches Aethelwulf and Alfred on a pilgrimage to Rome.
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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