The final instalment in the Orphans of the Tide trilogy, which The Times calls 'Unputdownable'.

The seas have parted to reveal the remains of humanity's lost empire and opened a path from Shipwreck Island to the Enemy's City. Now only Ellie Lancaster and her orphan friends can prevent a terrible war.

As Kate marches north at the head of her army, panic infests the City as the Enemy's strength grows. For the parting of the seas has also uncovered the Eternity Engine, a dreadful machine from before the Drowning, with the power to remake the world - or destroy it forever