Masterpiece Mystery In 2001, in one of his first great successes as a newly fledged Detective Inspector, Robbie Lewis arrested Graham Lawrie for the brutal murder of three police officers. The murders ceased; Lawrie was given a whole life sentence, ... (more)diagnosed with psychopathy during the trial, and was incarcerated in a secure psychiatric hospital. It felt like the nightmare was over. But thirteen years later the prosecution’s case is falling apart. The forensics laboratory that processed the DNA used to convict Lawrie has had its practice called into question and an appeal has been launched. Lewis fears the worst – but nothing can prepare him for the resumption of the original murders.