See the extensive library guide Mystery and Crime Fiction for reading suggestions.
AllReaders.Com. You can specify specific types of plots, settings, or characters.
Charles, John, et al. The Readers' Advisory Guide to Mystery. 2d ed. Also available in print, Z711.5 C48 2012. .
Herald, Diana Tixier. Genreflecting: A Guide to Popular Reading Interests. 7th ed. PS374 P63 R67 2013.