It delves into the relationship between a democratically elected government, the military and big business.

[1] In the run up to a general election, a devastating industrial accident on Teesside leaves 19 people dead and raises questions about the safety procedures of a US petrochemical company, PetroFex.

The British prime minister claims to have secured a compensation package from them, but on his return from PetroFex HQ, his plane crashes in the Atlantic under mysterious circumstances.

Deputy Prime Minister Tom Dawkins (Gabriel Byrne) takes command, and during his quest to find the truth and justice for the victims, he uncovers a conspiracy at the heart of the political system.

[1][2] Chris Mullin, the author of A Very British Coup, which served as inspiration for Secret State, appears as a vicar in a cameo role.