Agent Ben Green is MI5's newest recruit. With a stellar record to show so soon in his career, he is tasked with what appears to be an ordinary mission. When the seemingly ordinary mission goes wrong, Ben is thrown out of MI5, but finds a lifeline in the support of two agents who take a chance on the now disavowed agent.
As the agents work to unravel a larger and more deadly conspiracy, the looming danger is always just out of their reach and they find themselves in a race against time to stop a global threat and to clear their names.