7.7/ 10
Reviews
Where to watch
Amazon Prime Video
Peacock Premium
Philo
Britbox Apple TV Channel 
BritBox
BritBox Amazon Channel
Amazon Prime Video with Ads
Peacock Premium PlusOverview
Tense drama series about the different challenges faced by the British Security Service as they work against the clock to safeguard the nation. The title is a popular colloquialism for spies, and the series follows the work of a group of MI5 officers based at the service's Thames House headquarters, in a highly secure suite of offices known as The Grid.
