Two years following the post-credits scene of At World's End, 12-year old Henry Turner boards the Flying Dutchman to inform his father, Will Turner, that the mythical Trident of Poseidon is able to break his curse and free him from his ship, and of his intent to seek Jack Sparrow's help to find it. Will does not believe the Trident exists and orders Henry to leave his ship and never come back.

Nine years later (and five after the events On Stranger Tides), Henry works on a British Royal Navy warship. While chasing a pirate ship, Henry realizes they are sailing into the Devil's Triangle. The captain dismisses his concerns and has Henry locked up for attempting mutiny. Upon entering the Triangle, they come across a shipwreck, and are attacked by Captain Salazar and his undead crew, who slaughter everyone on board except Henry. Salazar sees a wanted poster of Jack and allows Henry to live so he can deliver a message to Jack, warning him that he will escape before leaving.

In Saint Martin, a young woman named Carina Smyth has been sentenced to death for witchcraft because of her knowledge of astronomy and horology. She escapes her cell and briefly runs into Jack, who is fleeing with his crew with a vault from a bank they have just robbed. Jack and his crew evade the British Army, but realize the vault they stole is empty; the entire contents, save for a single coin, had fallen out during the chase. Jack's crew angrily abandon him for letting them down. Even Gibbs, whom had stuck beside Jack for so many years, leaves, having lost faith in the captain. Carina later meets Henry, who is awaiting execution for his actions aboard the ship, and says she knows of a way to find the Trident. Carina helps him escape, but is caught by the British Army.

Disheartened after losing his crew, Jack goes to a local tavern and gives away his compass to pay for his drink. By forsaking the compass, however, he unwittingly unleashes Salazar and his crew from the Devil's Triangle. Shortly after, Jack is caught by the British Army. As he and Carina are about to be executed, Henry helps them escape with help from Jack's crew, and together they sail away on Jack's ship, the Dying Gull. Carina reveals the stars are the map that will lead them to the Trident, and reluctantly decides to team up with Henry and Jack in order to achieve their goals. While searching for Jack, Salazar and his crew roam the seas and destroy ships in Captain Barbossa's fleet. Barbossa meets with Salazar and offers to help find Jack in exchange for sparing his fleet. Salazar explains to Barbossa that he and his crew once sailed the seas hunting and killing pirates, and had nearly cleansed the seas of piracy before they ran into a young Jack Sparrow, who tricked them into sailing into the Devil's Triangle, where Salazar and his crew were cursed to remain undead.

When Salazar's ship finds the Dying Gull, Jack, Henry and Carina escape on a rowboat while the crew remains on board to cause a distraction. Salazar and his crew chase Jack, but upon arriving at a small island, Jack realizes Salazar's ghost crew cannot step on land. Barbossa arrives at the island and allies with Jack, restoring the Black Pearl, which had been trapped in a bottle in Jack's possession, to its original size. With Jack's compass, which he obtained from the sea-witch Shansa, Barbossa takes command of the ship and lets Carina navigate them to the island. During the trip, Jack and Barbossa realize that Carina is Barbossa's long-lost daughter. Barbossa tells Jack that he left her at an orphanage with his diary to make sure she lived a better life, never imagining that he would see her again.

The Pearl narrowly escapes a British Navy warship, which is destroyed by Salazar's ship. Jack and Salazar's crews clash. Meanwhile, Jack and Carina manage to activate the island's magic, which parts the ocean to reveal a hidden path along the ocean floor. Salazar captures Henry and possesses his body to pursue them. Jack and Carina locate the trident, but Salazar intervenes, fighting Jack and seizing the Trident. Henry, now free of Salazar, realizes that destroying the Trident will break all curses upon the sea and shatters it, returning Salazar and his crew to life. As the divided sea slowly caves in, the Pearl attempts to rescue Jack, Henry, Carina, and Barbossa, lowering the ship's anchor into the narrowing trench to pull them to safety, but

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