Overview

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.

Cast

Peter Firth

Harry Pearce

Nicola Walker

Ruth Evershed

Max Brown

Dimitri Levendis

Lara Pulver

Erin Watts

William Hope

Jim Coaver

Alex Lanipekun

Ben Kaplan

Geoffrey Streatfeild

Calum Reed

Tom Weston-Jones

Sasha Gavrik

Alice Krige

Elena Gavrik

Jonathan Hyde

Ilya Gavrik

Simon Russell Beale

William Towers