The 1930s British Edgar Wallace films

Just a heads up for any krimi fans out there: the book The Unknown 1930s: An Alternative History of the British Cinema 1929-1939 edited by Jeffrey Richards contains a chapter by James Chapman, 'Celluloid Shockers', which discusses the thriller genre in Britain during this time and relates it to the popular literature of Edgar Wallace, Sax Rohmer and other "sensation literature" writers. (The book also contains a chapter by Richards himself on Tod Slaughter, in which he charts a line of descent from Slaughter through Gainsborough through Hammer, for those more interested in British horror.)