Following the death of his parents, 16-year-old Simon moves into his grandparents' claustrophobic bungalow, which quickly becomes a refuge from his bullying peers. United by their voracious appetite for books, Simon and his grandmother stumble across the Great Big Book Exchange - a bookshop with a difference. There they meet impulsive, gothic Kelly and her boss, Terrance - and the friendships forged in the Great Big Book Exchange result in startling and unsettling consequences for all of them.