After a wreck, a small party endures tense days aboard a distant barque as a brooding captain's secret and proposals reshape life on deck. The narrator records shipboard routines, listens to a dramatic account of a past disaster, and participates in councils about leadership and survival. The voyage confronts storms and Cape Horn, leads to the discovery of a remote island, and forces plans for escape and repair. Through trials, practical seamanship and shifting responsibilities determine who will guide the survivors home, and the tale concludes with the ship's final departure and the characters' resolved fates.