Question: Tate Taylor directed the movie The Girl On The Train that was based on who's bestselling book?

Context articles: L.A. Mass Choir
Don Taylor (English director and playwright)
John R. Taylor
Stones into Schools
Riders of Death Valley
Barbara Tate
The Help (film)
Tate Taylor
The Girl on the Train (2016 film)
Margarete Böhme

The L.A. Mass Choir was an American gospel choir from Los Angeles.
 The group released several commercially successful albums in the late 1980s and 1990s, and was nominated for Stellar Awards and Gospel Music Excellence Awards.
 It was started by Tony Wilkins and Donald Taylor.
 Donald Taylor directed the choir.
Donald Victor Taylor (30 June 1936 – 11 November 2003; usually credited as Don Taylor) was an English writer, director and producer, active across theatre, radio and television for over forty years.
 He is most noted for his television work, particularly his early 1960s collaborations with the playwright David Mercer, much of whose early work Taylor directed for the BBC.
John Robert Taylor is an emeritus professor of physics at the University of Colorado, Boulder.
 He received his B.A. in mathematics at Cambridge University, and his Ph.D. from the University of California, Berkeley in 1963 with thesis advisor Geoffrey Chew.
 Taylor has written several college-level physics textbooks.
 His bestselling book is "An Introduction to Error Analysis", which has been translated into six languages.
 Taylor was designated a Presidential Teaching Scholar in 1991.
 He has also received an Emmy Award for his television series "Physics 4 Fun" (1988–1990).
Stones into Schools: Promoting Peace with Books, Not Bombs, in Afghanistan and Pakistan is a "New York Times" bestselling book by Greg Mortenson published by Viking in 2009.
 The book is the sequel to the bestselling book "Three Cups of Tea" and tells the story of Mortenson's humanitarian efforts to build schools in Pakistan and Afghanistan with his non-profit charity organization, Central Asia Institute (CAI).
 CAI reports that as of 2010, it has overseen the building over 171 schools in the two countries.
 These schools reportedly provide education to over 64,000 children, including 54,000 girls, where few education opportunities existed before in the remote regions of Pakistan and Afghanistan.
Riders of Death Valley is a 1941 Universal movie serial.
 It was a high budget serial with an all-star cast led by Dick Foran and Buck Jones.
 Ford Beebe and Ray Taylor directed.
Barbara Tate (2 June 1927 – 12 November 2009) was a British artist and writer, perhaps best known for her bestselling book "West End Girls", which was published shortly after her death.
The Help is a 2011 American period drama film directed and written by Tate Taylor and adapted from Kathryn Stockett's 2009 novel of the same name.
 The film features an ensemble cast that includes Jessica Chastain, Viola Davis, Bryce Dallas Howard, Allison Janney, Octavia Spencer, and Emma Stone.
 The film and novel recount the story of young white woman and aspiring journalist Eugenia "Skeeter" Phelan.
 The story focuses on her relationship with two black maids, Aibileen Clark and Minny Jackson, during the Civil Rights Movement in 1962 Jackson, Mississippi.
 In an attempt to become a legitimate journalist and writer, Skeeter decides to write a book from the point of view of the maids—referred to as "the help"— exposing the racism they are faced with as they work for white families.
Tate Taylor (born June 3, 1969) is an American actor, screenwriter, film producer and director.
 He is best known for directing "The Help" (2011), "Get on Up" (2014) and "The Girl on the Train" (2016).
The Girl on the Train is a 2016 American mystery thriller drama film directed by Tate Taylor and written by Erin Cressida Wilson, based on Paula Hawkins' 2015 debut novel of the same name.
 The film stars Emily Blunt, Rebecca Ferguson, Haley Bennett, Justin Theroux, Luke Evans, Allison Janney, Édgar Ramírez, and Lisa Kudrow, and follows an alcoholic divorcée who becomes involved in a missing persons investigation.
Margarete Böhme (8 May 1867 – 23 May 1939) was, arguably, one of the most widely read German writers of the early 20th century.
 Böhme authored 40 novels – as well as short stories, autobiographical sketches, and articles.
 "The Diary of a Lost Girl", first published in 1905 as "Tagebuch einer Verlorenen", is her best known and bestselling book.
 By the end of the 1920s, it had sold more than a million copies, ranking it among the bestselling books of its time.
 One contemporary scholar has called it “Perhaps the most notorious and certainly the commercially most successful autobiographical narrative of the early twentieth century.”