In the shadowy world between right and wrong, John Mercer is a modern-day gun for hire, beholden to his sinister master but not the boundaries – moral or otherwise – of the law.
When John Mercer is released from prison unexpectedly early he is introduced to Kenny Jameson – a police officer ‘retired on grounds of ill health’. Jameson makes it clear to Mercer that his freedom comes at a price – he must use the skills he gained serving as a deadly operative in the British Army’s Special Forces to remove an untouchable criminal who has recently dispatched a senior police officer to an early grave.
But Mercer is more concerned with the fact that he is expected to live with Calum – an irrepressible bundle of deviant energy whose main interests are girls, drugs and ‘slamming tunes’.
Mercer carries out the hit but finds that the promise of freedom was illusory and Blake had no intention of agreeing to his real liberty.
His growing relationship with Calum generates both poignancy and humour as the odd couple fight to maintain domestic harmony in the face of their apparent incompatibility. And all of this is complicated by the final member of Blake’s group of misfits – the beautiful and amoral Rose who has always used her sexuality as her primary weapon.
All of them must bring their unique talents to bear on the fundamental mission – to disorganise crime, and bring order where the law has failed. And at the same time, they must learn to protect and care for each other.