Pilar Ramirez and the Escape from Zafa

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"Twelve-year-old Pilar Violeta 'Purp' Ramirez's world is changing, and she doesn't care for it one bit. Her Chicago neighborhood is gentrifying and her chores have doubled since her sister, Lorena, left for college. The only constant is Abuela and Mami's code of silence around her cousin Natasha--who vanished in the Dominican Republic fifty years ago during the Trujillo dictatorship. When Pilar hears that Lorena's professor studies such disappearances, she hops on the next train to dig deeper into her family's mystery. After snooping around the professor's empty office, she discovers a folder with her cousin's name on it...and gets sucked into the blank page within. She lands on Zafa, an island swarming with coconut-shaped demons, butterfly shapeshifters, and a sinister magical prison where her cousin is being held captive. Pilar will have to go toe-to-toe with the fearsome Dominican boogeyman, El Cuco, if she has any hope of freeing Natasha and getting back home." -- Amazon