Seasons & episodes

At GCHQ, Danny's under pressure dealing with the fallout from the Russian cyber-attack when a bold new threat emerges.

Vadim finds himself working in captivity for the Chinese. At GCHQ, Danny and Roz clash over China, and the mole hunt continues...

When Barbara's charming ex-boyfriend, Nicky Chan, re-appears in her life, she is forced to make an impossible decision.

While Danny becomes increasingly concerned about Barbara's erratic behaviour, malware causes havoc across government departments.

No episode summary available yet.

No episode summary available yet.