This book is a collection of great essays which discuss four brilliant and impressive investigators and detectives in literary masterpieces by Arthur Conan Doyle, Agatha Christie, and Dorothy Bowers. The focus of this book is on Sherlock Holmes, Hercule Poirot, Jane Marple, and Dan Pardoe. These highly intelligent, perceptive, problem-solving, resilient, and resourceful investigators are committed to examining the evidence in any situation carefully, fairly, and honestly and devoted to searching for and discovering the truth in various criminal cases, even though such heroic endeavors frequently threaten their own lives. In Chapter Seven of Agatha Christie’s The Murder of Roger Ackroyd Hercule Poirot agrees to accept the case which is presented to him only if he may go through with it to the end and search for all the truth. In numerous investigations Sherlock Holmes, Hercule Poirot, Jane Marple, and Dan Pardoe demonstrate not only an extraordinary commitment to searching meticulously and valiantly for the whole truth but also the absolute genius to discover it.