Question: Heatstroke stars an actress who has written how many non-fiction books?
Context: Heatstroke is a Sci Fi Channel original movie.  The film stars D. B. Sweeney and Danica McKellar.  It was made by the team that made "Farscape".  The film was written by Richard Manning and David Kemper, produced by David Kemper, and directed by Andrew Prowse. Dame Marina Sarah Warner, {'1': ", '2': ", '3': ", '4': "} (born 1946) is a British novelist, short story writer, historian and mythographer.  She is known for her many non-fiction books relating to feminism and myth.  She has written for many publications, including "The London Review of Books", the "New Statesman", "Sunday Times", "The Telegraph" and "Vogue".  She has been a visiting professor, given lectures and taught on the faculties of many universities. Danica Mae McKellar (born January 3, 1975) is an American actress, mathematics writer, and education advocate.  She played Kevin Arnold's on-off girlfriend Winnie Cooper in the television series "The Wonder Years", and later wrote five non-fiction books: "Math Doesn't Suck", "Kiss My Math", "Hot X: Algebra Exposed", "Girls Get Curves: Geometry Takes Shape", which encourage middle-school and high-school girls to have confidence and succeed in mathematics, and "Goodnight, numbers".  From 2010-2012 and 2018–present, McKellar voiced Miss Martian in the animated superhero series Young Justice.  In 2015 Mckellar was cast in the Netflix original series "Project Mc". Elaine Marie Alphin (October 30, 1955 in San Francisco, California – August 19, 2014 in Glenrock, Wyoming) was an award-winning author of more than thirty books for children and young adults.  Although she specializes in fiction, she has published many non-fiction titles, including biographies of Davy Crockett, Louis Pasteur, Dwight Eisenhower, and John Paul Jones, which she co-wrote with her husband Arthur Alphin (as part of Lerner Publishing's History Maker Biographies series). Thomas E. Gaddis (September 14, 1908 - October 10, 1984) was a United States author, most noted for his book about convicted murderer Robert Stroud, who was known as the "Birdman of Alcatraz".  Gaddis was born in Denver, Colorado.  He wrote many non-fiction books, mostly biographies.  In addition to "Birdman of Alcatraz" (1955), he was author of "" (1970), about American serial killer Carl Panzram. Raymond Hull (1919–1985) was a Canadian playwright, television screenwriter, and lecturer.  He also wrote many non-fiction books, numerous magazine articles, short stories, and poetry.  He is best known as the co-author of the book The Peter Principle with Laurence J. Peter.  He is also known for the saying "He who trims himself to suit everyone will soon whittle himself away." Win Blevins (born October 21, 1938) is a New York Times Bestselling American author of historical fiction, narrative non-fiction, historical fantasy, and non-fiction books, as well as short stories, novellas, articles, reviews, and screenplays.  He has written many books about the western mountain trappers, and is known for his "mastery of western lore."  His notable works include Stone Song, So Wild a Dream, and Dictionary of the American West.  According to WorldCat, the Dictionary of the American West is held in 728 libraries.  Blevins has won numerous awards, including being named winner of the Owen Wister Award for Lifetime Achievement in writing literature of the West, being selected for the Western Writers Hall of Fame, being twice named 'Writer of the Year' by Wordcraft Circle of Native Writers, and winning two Spur Awards for Novel of the West. Harold "Hal" Glen Borland (May 14, 1900 – February 22, 1978) was a well-known American author, journalist and naturalist.  In addition to writing many non-fiction and fiction books about the outdoors, he was a staff writer and editorialist for "The New York Times". Krishnalal Shridharani (16 September 1911 – 23 July 1960) was an Indian poet, playwright and journalist.  He studied sociology, economics and journalism at various institutions in India and the US.  He participated in the Indian independence movement and was imprisoned, during which time he started writing plays and poetry.  He also wrote many non-fiction books in English. Kai Linnilä (died 24 August 2017) was a Finnish editor and the writer of many non-fiction books as well as the husband of the novelist Kaari Utrio.  He was also responsible for the importation and marketing of cigars and pipes in the Oy Amanita Ltd, owned by the Utrios family.
Answer: five