Two soldiers: Britain's most celebrated military hero and a broken veteran living in the gutters of London. Their paths last crossed nearly twenty years ago. Now, amidst a hostage crisis in the Middle East, their lives are about to collide again. And the Strike Back is about to begin.

John Porter was involved in a hostage raid in Lebanon in 1989. The raid went disastrously wrong, several regiment men died, John spared the life of a Lebanese fighter and blames himself for the deaths. Struggling to come to terms with the past, John has hit the bottle and is sleeping rough.

Colonel Peregrine Collinson was involved in the same raid. He was awarded a Military Cross and is heralded as a military hero.

After the disastrous raid, their lives couldn't have been further apart. Until now. A hostage crisis in the Middle East draws the enemies back together for the first time. Who will be the hero this time?