Unbreakable Chains (解かれ得ぬ鎖, Tokare Enu Kusari) is the 4th chapter in the series.
Halfdan arrives at the harbor looking for his slave who escaped. Leif Erikson tries to keep the peace with him and the villagers, while Thors tries to save the slave's life. The slave starts to hallucinate as he is dying and dreams of better places and Thors tells him of Vinland. Halfdan arrives and finds his slave and demands him be returned. Thors then barters for the slave and ends up paying 8 sheep in exchange. They then bury the slave and Thorfinn comes to terms with his ancestors running away in the past.