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.
Captain Flint is warned about Billy. Vane encounters someone from his past. Eleanor asks her father for help. The crew of The Walrus suffer a disastrous undertaking.
Flint comes clean with Gates. Randall's actions cause problems for Silver. Eleanor suffers a loss. Max helps Rackham. Vane faces his biggest challenge.