Luminari

Nine-year-old Brandy is kidnapped by the terrifying ghost queen from her grandfather's fairytales. Now it's up to Bailey a boy who thought he was too old for fairytales to rescue her.
He ventures alone to the illusive and highly dangerous spirit world of Luminari. With the help of a fury friend with a loudmouth and brash leap before you look attitude, he sets out on the adventure of a lifetime. He must pass many tests to prove his intelligence, kindness, and above all else bravery. Something Bailey would never consider a strength of his. He is known as the chubby kid with thick glasses and asthma who the other children poke fun at. He is not the strong and brave hero his sister needs, but if he ever wants to see her again, he will have to be or die trying.
On his journey he meets many friends and even more foe, and he learns of a secret even his grandpa didn't know about.