That's not a truce, Arthur thinks to himself, that's a deal. A truce is about inaction, and Evie is asking for action from Hillingdon. A very big action, in fact.

"You want to take out Harris from the inside?" he says, suspiciously. He believes it, but to come to Hillingdon of all places. Sure, they know what they're doing, but it's not like they could expect friendship after Harris is gone, and it's not like Hillingdon's going to trust Islington to take charge of the situation in a way that works for everyone. All of which begs the question, "And after that? How do we know whoever replaces him will keep to the old laws like you want?"