Nell Young has lived her life in and around maps. Her father, Dr David Young, was one of the most respected cartographers in the world. He's also just been found dead - in his office at the New York Public Library.

Nell hadn't spoken to him in years - ever since he fired her after an argument over a seemingly worthless highway roadside map. A map which was mass-produced - and every copy of which is being found and destroyed.

But why?

Answering that question will take Nell on a dangerous journey into the heart of a conspiracy beyond belief, a secret about her family, and the true power that lies in maps...