Forty years ago, Steven "Smithy" Smith found a copy of a famous children's book by disgraced author Edith Twyford, its margins full of strange markings and annotations. When he showed it to his remedial English teacher Miss Iles, she believed that it was part of a secret code that ran through all of Twyford's novels. Now, out of prison after a long stretch, Smithy decides to investigate the mystery that has haunted him for decades. But it soon becomes clear that Edith Twyford wasn't just a writer of forgotten children's stories. The Twyford Code holds a great secret, and Smithy may just have the key.