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tuatara1 TLDR its politics and conspiracies.
Demon queen genuinely wants to make peace with humans, so she wants to hold peace meeting. But the human king and his minister distrust her, and think she is trying to entrap them like her evil brother did in the last war. Now they want to "return the favour", by using the heroes to hit back at the queen in a pre-emptive strike. Meanwhile they've also managed to get some demons to back them like the bridgekeeper, because they're opposed to queen's pacifist ideas. Also king has some mysterious new ally who the demon spy at the end recognizes.