It's the news every parent dreads: Ed Lister's world changes forever the day he hears his art-student daughter has been brutally murdered in Florence.

A year later, frustrated with the police inquiry, Ed vows to find Sophie's killer. His quest leads to a mysterious website - and its owner, Ward, a charming, brilliant psychopath.

But as the search for Ward follows a trail of bodies across Europe to America, some of Ed's own secrets begin to emerge. And the question arises: is Ed the hunter, or the hunted?