Op Spectrum is the code name for a select group of British Special Force operators who carry out what are jokingly referred to as "Certain Death" missions. These missions have a very high risk of compromise. Op Spectrum personnel are recruited from the SAS and SBS units, and come under the direct control of the British Security Agencies. Every mission they're sent on are termed 'deniable operations'. SSgt Jack Butler and his team are sent on deniable operations where they would be disavowed if anything went wrong. They are specialists in Counter terrorism, hostage rescue, and surveillance. Their mission, to hunt down an extremist terrorist group. The action takes them from the jungles of Central America, to Europe, the USA and the Middle East. They have to use all their soldiering skills, ingenuity, stealth and courage in the face of a cunning and dangerous enemy, where failure is not an option.