Michael Turner is a successful crime writer and part time police consultant, who lives in the Algarve with his wife Samantha, an ex-police surgeon who now runs her own private medical practice. After their previous successes with the ‘Mijas Murderer’ and the elusive ‘Faro Forger’, they now work regularly with Interpol, and when Sam is informed by the Salzburg police that her ex flat mate has sadly committed suicide, Sam refuses to believe it, and she and Michael set out to prove it has to be murder. Sam is of course correct, and the hunt for the murderer begins. Their enquiries take them to Austria, the UK, Malta, Poland, Rome, San Juan in Puerto Rico and numerous other locations. Working closely with their Interpol colleagues, the Metropolitan police in London and the Salzburg police, they run into one blind alley after another in trying to trace and arrest the murderer who seems to be able to change their appearance at will.