Book excerpt: In honor of the 70th birthday of Professor Douglas G. Greene, mystery genre scholar and publisher, this book offers 24 new essays and two reprinted classics on detective fiction by contributors around the world, including ten Edgar (Mystery Writers of America) winners and nominees. The essays cover a myriad of authors and books from more than a century, from J.S. Fletcher's The Investigators, originally serialized in 1901, to P.D. James' Death Comes to Pemberley, published at the end of 2011. Subjects covered include detective fiction in the Edwardian era and the "Golden Age" between the two world wars; hard-boiled detective fiction; mysteries and intellectuals; and pastiches, short stories and radio plays.