Revolution (Chronicles of Charanthe #2‪)‬

Why is the Empress suddenly so interested in the drylands north of the Empire? Eleanor and Daniel don't agree on much, but when they're sent to investigate strange happenings near the border between two foreign states, neither of them is really sure why they're there. And things at home aren't making much more sense. The rebels are causing chaos in the streets, whilst the Empress is grows ever more demanding of her citizens - especially the skilled assassins of the Association.

Revolution is the second Chronicles of Charanthe novel.