Six of crows, Leigh Bardugo

The Ice Court had been built to withstand an onslaught of armies, assassins, Grisha, and spies. When Inej said as much to Kaz, he simply replied, "But it hasn't been built to keep us out." His confidence unnerved her. "What makes you think we can do this? There will be other teams out there, trained soldiers and spies, people with years of experience." "This isn't a job for trained soldiers and spies. It's a job for thugs and thieves."