 In addition to Christie, Brand, Sayers, Mitchell, and Tey, major writers also included Margey Allingham and Ngaio Marsh.Over time, certain conventions and clichés developed which limited surprise on the part of the reader – vis-à-vis details of the plot – the identity of the murderer.Several authors excelled, after successfully misleading their readers, in revealing an unlikely suspect as the real villain of the story.