After 16-year-old Alice Palmer drowns in a local dam, her family experiences a series of strange, inexplicable events centered in and around their home. Unsettled, the Palmers seek the help of psychic and parapsychologist, who discovers that Alice led a secret, double life. At Lake Mungo, Alice's secret past emerges.
Thrust into an all-new adventure, a down-on-his-luck Capt. Jack Sparrow feels the winds of ill-fortune blowing even more strongly when deadly ghost sailors led by his old nemesis, the evil Capt. Salazar, escape from the Devil's Triangle. Jack's only hope of survival lies in seeking out the legendary Trident of Poseidon, but to find it, he must forge an uneasy alliance with a brilliant and beautiful astronomer and a headstrong young man in the British navy.