Kemp, cold and blinkered, is driven by the implacable desire for justice, while Frederick Ashton, a proselytising abolitionist, is fired by an equal but opposite sense of righteousness. For both men their cause is more important than any human damage that might result. And then there is Sullivan, a crew member who has escaped from prison and made a vow to get to a mining village near Durham and tell the family of a shipmate how the man died. The arc of these three quests points to a seemingly inevitable clash.