Plot summary
Bjorn has set off alone into the harsh Scandinavian winter. Helga frees Floki from his bonds. Ragnar confronts Helga, who admits what she has done, and he tells her that he understands. Ubbe accompanies the manhunt for Floki and discovers him hiding in a stream. After he is captured, Ragnar chains Floki inside a damp cave. Ragnar finds Helga digging a grave in the frozen ground for her daughter. In Wessex, King Ecbert proposes to rescue Princess Kwenthrith of Mercia and her child, who is being held by rebel nobles. Aethelwulf engages in battle and rescues Kwenthrith. Aethelwulf does not know that his wife Judith is sleeping with his father. In Francia, Duke Rollo tries to assimilate by cutting his hair and dressing appropriately but continues to be mocked by his new wife. He proposes building forts to stop the Vikings from sailing upriver.
Credits
Adapted from Wikipedia contributors, Vikings season 4. HTML formatting and reference markers removed.