Unfaithfully Yours by Nigel Williams

This book is written exclusively in the form of letters between six people – five old friends who have lost touch and a private investigator.  Setting out the book like this means it is sometimes artificial as plot turns have to be crowbarred into a letter in a way which does not read very naturally.  This is not helped by the fact that the plot itself is unrealistic.  I appreciate this is intended to be a black suburban comedy rather than a real life story but it is still a little incredible.  And it is not funny.