A Defesa do Reino was released in the year 1985。A Defesa do Reino is also called as Defence of the Realm, Dossier confidenziale, Dilema de um Jornalista, Defense of the Realm, Conspiración para el silencio, Button - Im Sumpf der Atommafia, Lüge und was kommt danach?, Atom, A Birodalom védelme。

A reporter Mullen 'stumbles' on a story linking a prominent Member of Parliament to a KGB agent. In fact it is also linked to a near Nuclear disaster involving a teenage runaway and an Americal USAF base. Has there been a Government cover-up,Mullen teams up with Vernon Bayliss, an old hack, and Nina Beckam the MP's assistant to find out the truth.

A Defesa do Reino actors and actresses include Gabriel Byrne, Greta Scacchi, Ian Bannen, Robbie Coltrane。