Whilst facing threats on all sides, including a possible mutiny, Captain Flint hires a young sailor named John Silver, who hides his most precious possession. As the Royal Navy gets ever more powerful, Eleanor keeps order on New Providence.
While Flint and Gates realise they need help to find the Urca d'Lima, John and Billy have to increase the crew's morale. Vane impresses Eleanor and Gates receives a promotion.
The Walrus crew is stranded, with an army of Spanish soldiers standing between them and the precious Urca gold. With their crimes against their brethren no longer a secret, Flint and Silver must join forces in a desperate bid for survival.
Flint and his crew wage war against the world. Eleanor receives an offer of clemency. Vane objects to Rackham's methods. One of Nassau's most notorious returns.
The Walrus crew battles the elements. Teach and Rackham have a disagreement. Rogers and Eleanor set terms for their partnership. Bonny fears for her future with Max.
Stranded at sea, Flint pushes Silver to his limit. As Nassau prepares to repel an invasion, Rackham takes the reins, while Max gets her house in order. To stave off defeat, Vane makes a difficult choice.
Civilization returns to Nassau, and sets its sights on Vane. Flint, Silver and Billy encounter a new enemy. Rackham takes a stand against his crew. Scott finds his place in the new regime.
Facing certain death, Silver pushes Flint to take action. Teach shows Vane a way forward. A new threat puts Eleanor and Rogers on notice. Max makes her play.
The invasion of Nassau results in catastrophe, while Teach and Rackham look to avenge the death of Charles Vane and Eleanor gets acclimated to her new role.