London 1666, the Great Plague rages and the city is a dangerous place. Young Nick Truelove blames his King, Charles II, for the hardship he faces, and vows to get revenge.

Inspired by the bold behaviour and wily cunning of a young raven, he bluffs his way into the centre of the King's power, the Tower of London itself.

But, as a remarkable friendship grows up between boy and raven, a new danger engulfs London. Nick's view of the world and his King is about to be changed forever.