Adam Lawrence has been trained and educated by MI6 but his career seems to be at a standstill. When the past catches up with him in the form of Kara, a Russian spy with whom he shares a complicated past, he is forced to question everything and everyone in his life. A love triangle develops between Kara, Adam and his wife Maddy; three people trying to uncover each other's secrets and navigate between political and diplomatic relationships. Meanwhile, they try to hold on to their personal lives and those they love most.