The 1980s. Anti-nuclear protests. And in the thick of it all, beautiful Claire Oldham - until the day she turns up brutally murdered. A young, troubled drifter Martin Grove, is swiftly prosecuted and jailed for the crime. Fast forward 20 years: Martin Grove, walks free cleared by advances in forensic science. Fast forward a few more years, come right up to date: Martin Grove is shot dead in his reclusive home, "executed" at close range. DCI Jacobson and his team are on the case.