The Left-Handed Shell — James Grant

When Harry, a small-time detective, agrees to look after Jenny and her friend Jacintha - the daughter of a millionaire - little does he realise that he and his giant-sized cousin Stanley are going to become involved in a kidnapping. The girls must be found, and what at first seems to be a straightforward kidnapping becomes more complicated. Why are all these people being killed? Where are the girls? Who are the kidnappers, and what has a left-handed shell to do with all this?