True crime books often center on sensational, shocking, or strange events, particularly murder. Even though murder makes up less than 20% of reported crime, it is present in most true crime stories. Typically, these books report on a crime from the beginning of its investigation to its legal proceedings. Serial killers have been a highly profitable sub-genre. An informal survey conducted by "Publishers Weekly" in 1993 concluded that the more popular true crime books focus on serial killers, with the more gruesome and grotesque content performing even better.