A leading team of analysts, buried in the heart of GCHQ, secretly works to ward off a series of cyber-attacks on the UK in the run-up to the 2024 general election. When a routine stress test of internet infrastructure goes awry, 21-year-old GCHQ intern Saara Parvin suddenly finds herself operating on the invisible frontier of high-stakes cyber warfare. In a thrilling cat-and-mouse game, newcomer Saara and the team must try to stay one step ahead and anticipate their opponents' every hidden move. Peter Kosminsky's high-stakes thriller stars Adrian Lester, Simon Pegg, Hannah Khalique-Brown, Maisie Richardson-Sellers, Adrian Lester and Alex Jennings.

S1 Ep1 60min