Title: Murder on the Links by Agatha Christie
Comments: One of Agatha Christie's earliest books that really doesn't stand the test of time. Accompanied by his faithful friend, Hastings, Hercule Poirot is summoned to the home of a millionaire - only to discover he has been murdered just prior to their arrival. His wife, found firmly bound and gagged, tells a strange story about two strangers who took her husband away demanding a 'secret'. But there are plenty of people close to the household who might have had a motive for his death.
Poirot has a major personality clash with the local police officer investigating the case - both display annoying levels of arrogant superiority in their own way. Hastings almost bungles the investigation through his romantic pursuits. And while no-one expects a book written in the 1920s to have high-level DNA forensics, if Poirot can identify a stab wound made after death, one would expect the examining doctor to do the same.