Book Of Lies

A 15 year old boy finds a book in his attic. It belonged to his great grandfather. He carries it around with him everywhere. After a while, he started to notice something strange. The book glowed every time he lied. He even tried to get rid of the book, but with every attempt came a fail. Eventually, he told the biggest lie in his life and was called out for it. The book pulled him into another world to challenge him. He must live there until he learns to behave. If not, he'll be executed.