Tinker Bell is a fairy, the sister of Periwinkle, and the best friend of Peter Pan. She appears Return to the Isle of the Lost: A Descendants Novel when Ben travels to Neverland to ask her for help.
One night in London, Tinker Bell and Peter Pan visit the home of the Darling family as he accidentally left his living shadow there during one of his previous visits. Using her light, Tinker Bell scopes through the house. While searching, Tinker Bell finds and lands on a hand mirror and looks at herself, they eventually find the shadow, but accidentally trap Tink inside, and wake Wendy Darling, the oldest Darling child, in the process. Wendy helps put Peter's Shadow back on by sewing it, Tinker Bell, however tries to get out of the drawer by climbing through a keyhole, and getting stuck in the process, but gets unstuck when Wendy get the sewing kit to help Peter.
Wendy is heavily infatuated with the stories of Peter Pan and the Lost Boys and appears to have a crush on the boy as well. This angers Tinker Bell, making her red with jealously and even calling Wendy a "big ugly girl". Soon enough, Wendy explains that she may never see Peter again as her father is forcing her to "grow up" and leave the Pan stories in the past.
Because Peter enjoys Wendy's stories of his adventures, he offers her a chance to stay in Neverland, where she will never have to grow up. Tinker Bell is disgusted by the very idea, and refuses to bestow her pixie dust upon Wendy and her younger brothers ,John and Michael. However, Peter simply spanks the fairy dust out of Tink and unto the Darlings, giving them the ability to fly to Neverland. Once they've arrived, the group is attacked by Pan's nemesis Captain Hook. Peter orders Tink to take the Darlings to the island for safety, but Tink leaves them in her dust. She heads to Hangman's Tree where she, Peter, and the Lost Boys reside. She tells the boys that Pan has ordered them to shoot down the Wendy Bird.
The boys do as they thought they were told and when Peter finds out, he is furious. Lost Boy Cubby reveals that it was Tink that gave them the order and Peter banishes the fairy for a week as punishment. Later that night, Captain Hook's first mate, Mr. Smee, kidnaps Tink and takes her to Hook's ship where the captain attempts to toy with Tink's emotions to get her to reveal Peter's hideout. He tells her the pirates are planning on shanghaiing Wendy, and the plot makes Tink more than happy as, with Wendy out of the way, she and Peter can be together again. She points the way to the hideout on the map, but before she completes this, she forces Hook to promise not to lay one single finger or a hook on Peter Pan. Hook agrees, trapping her in a lantern once she reveals the location.
The next morning, Wendy, her brothers and the Lost Boys are captured and given the choice of becoming pirates or walking the plank. Wendy convinces the boys to refuse the offer, in high hopes that Pan will save them. Meanwhile, Hook reveals his plot to plant a bomb in Peter's hideout, disguised as a gift from Wendy. When Tink hears this, she breaks free of her trap and heads for Hangman's Tree. There, she tries to warn Peter, but he brushes her claims off as nonsense. The bomb begins to ring rapidly, ready to explode, but Tink takes it away from Peter and sacrifices herself.
In the rubble of Hangman's Tree, Peter is safe, but Tink is fatally injured. Peter restores her life by telling her just how much she means to him. With Tink saved, Peter heads to the Jolly Roger to rescue his friends. A battle occurs, ending with Captain Hook fleeing for his life from the crocodile, who ate his left hand and now wants the rest of the captain cause he tastes "good". With Hook defeated, Peter decides to escort Wendy home, having Tink sprinkle fairy dust all over Hook's ship.