Jay and Audrey leave Auradon to rescue Audrey, but they are met with a storm. They fall into water but they are rescued by Captain Hook. But Captain Hook had another reason for rescuing Jay. He wants Jay to steal a magic book from Mal - the Book of Shadows.
Maleficent is furious to find out that Mal is a Monsterling. Mal tries to convince that the spells in the Book of Shadows can cure Monsterlings. Maleficent thinks all magic spells written in the Book of Shadows are dangerous and she doesn't want Mal to use any of the magic spells inside.
Jay steals the Book of Shadows and delivers it to Captain Hook. But Captain Hook doesn't know how to read the book. He now wants Jay to find someone who can read it.