While the tension at the heart of the story hinges on two of the main characters making choices that go against their nature ([spoiler]Adam & Maddie's relationship is clearly strong enough for him to have revealed his brief involvement with Kara 15 years ago + Maddie is way too smart to ever go along with her CIA agent friend[/spoiler]), _Treason_ is an otherwise fun ride with lots of twists and turns. The action set pieces and plot twists all entertain, and since it's a British production, the acting is, for the most part, terrific. Charlie Cox is a joy to watch as a good guy stuck in (what is to him) an impossible situation. Or is he a double agent trying to cover his tracks? And Olga Kurylenko does a great job as Kara Yerzov, either the scorned mastermind of a scheme to take control of MI6 or a vengeful Russian patriot looking to right an old wrong. The show's quick runtime means that it never drags, though character development does end up feeling a bit rushed at times, as some of the side players could have used a little more fleshing out. The writers have clearly chosen to focus on the main plot, though, and in that sense they succeeded in making an inherently binge-able show, even if you're left wanting a bit more in some spots. Besides those crazy character choices at the heart of the story, the show's most glaring weakness is Tracy Ifeachor's CIA agent Dede Alexander. As is so often the case with British productions, when they need to include an American character it's usually the worst of the ensemble, as the baseline talent of the UK's population of actors is so far superior to that of the US that the gap in quality between their performances is almost laughable. (Just take a look at all of the bit players in season 1 of _Andor_ to see what I mean. "Pockets!") The other acting quibble that I've got is with Oona Chaplin's choices for her performance of Maddy Lawrence. She's supposed to be a veteran of Afghanistan, yet comes off as just a bit too waif-ish, even at the end. I feel like there could have been more weight and dread behind her eyes as she realized what she was mixed up in and what skills/knowledge she would have to reactivate in order to get through it. But in the end the story kept me guessing right until the credits rolled, and the main players - flawed choices aside - all had me rooting for them, even as I questioned weather I should. I had a good time watching _Treason_, even if it wasn't quite all that it could have been.