A shocking truth lies within the pages of an ancient library, locked inside a high-security complex deep beneath the Nevada desert. And the US government will stop at nothing to keep it classified. But now a shadowy group of ex-employees want the world to know – however terrifying the disclosure might prove to be. And when a single volume missing from the original collection mysteriously surfaces at a London auction house, they persuade former FBI agent Will Piper to help them obtain it and unlock the ultimate secret of the library, once and for all.