Aye Spy

The city of towers.
The city of spies.
On the eve of the summer solstice, Dart and Anna are without a captain and without a plan. With a deadline to meet and the clock ticking down, they will need every trick up their sleeves just to stay in the game. But do they have what it takes to outsmart an entire city of spies?
From the award-winning author of Pie Rats comes the code-cracking second series.