Years ago, Steven Smith found a copy of a children's book, its margins full of strange markings. It unlocked a strange chain of events. Convinced that the book holds the key to solving a puzzle, he wants to investigate. But it soon becomes clear that the Twyford Code has great power, and he isn't the only one trying to solve it. It's time to solve the murder of the century...
The new novel from the Sunday Times bestselling author of "The Appeal" will keep you up puzzling late into the night.