political parties that are 'at daggers drawn' (with each other)
They 'looked daggers at' each other across the table.
a 'cloak-and-dagger' novel
(..) Yet, here you are in the North, undermining them. Why gamble with your position? Every ambitious move is a gamble. You gambled when you drove a dagger into Robb Stark's heart. It appears that your gamble paid off. You're Warden of the North. I had Tywin Lannister backing. Who supports me now? You? (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3