Crime Nonfiction is a non-fiction literary and film genre in which the author examines an actual crime and details the actions of real people. The crimes most commonly include murder, but true crime works have also touched on other legal cases. Depending on the writer, true crime can adhere strictly to well-established facts in journalistic fashion, or can be highly speculative. Some true crime works are "instant books" produced quickly to capitalize on popular demand, while others may reflect years of thoughtful research and inquiry and may have considerable literary merit. Still others revisit historic crimes (or alleged crimes) and propose solutions, such as books examining political assassinations, well-known unsolved murders, or the deaths of celebrities.