Jack, Scarlet and Mr Doyle return for their next action-packed adventure.

When the world's deadliest assassin, the Chameleon, escapes from prison, Jack begins his most dangerous investigation yet.

With only the scantest of clues, the team travels from London to New York, a bustling metropolis filled with airships, steam cars and exciting new ideas.

Here they uncover a terrible plot that threatens the president's life and brings the nation to the brink of civil war. Can Jack track down the Chameleon in time? And just what is the mysterious whip of fire that has the power to wreak destruction across the world?