I have now read all of the Christie series. I feel this one is probably one of the best. Only one real external, (to the police) character re-appears, and he is not the usual informant.
At some stages I wondered if the book contained an element of collaboration? However I was pleased to read aspects of actions and feelings that only a detective, who has experienced them, could really relate.
Only one aspect in the latter stages, had me wondering if Christie, really would have sought to have safeguarded the rights of one in the intersts of many? to say more would spoil it for the potential reader.
Could not really put down. Crisp and to the point, the story moves at great pace without missing important aspects of policing.Every page is of interest. How he has merged to story lines is very good.
Hope there are more to come!