True crime is a non-fiction literary genre in which the author uses an actual crime an real people as a point of departure. The crimes almost always include murder. They can be fairly factual or highly speculative and heavily fictionalized depending on the writer. Some works are "instant books" produced quickly to capitalize on popular demand while others may reflect years of thoughtful research and inquiry. Still others revisit historic crimes (or alleged crimes) and propose solutions, such as books examining political assassinations, well-known unsolved murders, or deaths of celebrities.