New Orleans is known for its ghosts. But Henry still doesn't expect an old enemy to pop up as he's trying to find an ancient book. And while it's not surprising when that person tries to kill him, it gets a little confusing when they save him as he's escaping from the Six.

Now Henry and Lucy have some unwanted cargo as they sail to London, racing against the Six in their hunt for the first piece of the clasp.

If they can find and assemble all four pieces, they can save the world. Without the first, they're dead in the water. Maybe even literally.

It's a dangerous game when they're still not certain if the shadowy figure is friend or foe.

And knowing who to trust is half the battle.

Knowing when to trust them is the other half.