The only way to catch a killer is to think like one... When a senior Metropolitan Police officer and High Court judge die in quick succession, criminal profiler Doctor Alex Gregory is convinced their deaths are linked to the most shameful case of his career: the notorious wrongful conviction of Carl Deere, an innocent man found guilty of a series of heinous murders perpetrated by the 'Soho Killer'. Four years later, released from prison and with his record wiped clean, Deere is an invisible spectre with a new name and a new face. But, as Gregory knows only too well, the past isn't easily forgotten, and revenge can be a powerful motive - even for an innocent man... With Scotland Yard determined to avoid any further scandal, Gregory and his friend and mentor, Professor Bill Douglas, are left to fend for themselves. With no real evidence and the body count racking up, they know it's only a matter of time before their names are next on the killer's list...