It was designed by John Lambshead and Gordon Paterson, and programmed by Ben Notarianni, Rupert Bowater and Paul Norris of the Electronic Pencil Company.

The PC version was written in 8086 assembler and used CGA graphics in 4 colour mode.

The game comprises three sections: "The NATO Documents", "The Bomb" and "The SAS Assault".

Somewhere in England, a burglar steals the famous Glen Diamonds, but he also finds some secret NATO documents.

The Cencom icon offers access to Preston's personal files where the player can store information throughout the first part of the game.

This part of the trilogy requires text input and plays differently depending on the version of the game.