I find that Dame Agatha Christie is the greatest crime writer ever. Her ingenuity lies in her ability to surprise the reader each time with the real criminal. Her best book was "The Murder of Roger Ackroyd" because the murderer is a BIG surprise. The character of Hercule Poirot is one of literature's greatest creations and his powers of deduction are SUPER. He is a more eccentric detective than Sherlock Holmes and I find him more amusing.