Question: In between Patricia Highsmith and Donald Harington, who's  first novel was "Strangers on a Train"?

Context paragraphs:
The Two Faces of January: The Two Faces of January (1964) is a psychological thriller novel by Patricia Highsmith.  Its title alludes to the two faces of the Roman god Janus, after whom the month of January was named.  Biographer Andrew Wilson, in his 2003 publication "Beautiful Shadow: A Life of Patricia Highsmith" claims the title is 'appropriate for the janus-faced, flux-like nature of her protagonists'.

Stay More: The World of Donald Harington: Stay More: The World of Donald Harington is a 2013 documentary film about author Donald Harington, produced by Brian Walter based on interviews that Walter conducted with Harington and his wife in 2006–07.

The Price of Salt: The Price of Salt (later republished under the title Carol) is a 1952 romance novel by Patricia Highsmith, first published under the pseudonym "Claire Morgan".  Highsmith—known as a suspense writer based on her psychological thriller "Strangers on a Train"—used an alias because she did not want to be tagged as "a lesbian-book writer", and because of the use of her own life references for characters and occurrences in the story.  Though Highsmith had many sexual and romantic relationships with women and wrote over 22 novels and numerous short stories, "The Price of Salt" is her only novel about an unequivocal lesbian relationship and its relatively happy ending was unprecedented in lesbian literature.  It is also notable for being the only one of her novels with not only "a conventional 'happy ending but in which her characters also had "more explicit sexual existences".

The Pitcher Shower: The Pitcher Shower (2005) is a novel by Donald Harington set in the Arkansas part of the Ozarks in fictional towns near the fictional town of Stay More, the setting for Harington's other novels.  The main character drives from town to town showing movies or "pitchers" (so he is a "pitcher shower") on improvised screens outdoors.

Strangers on a Train (film): Strangers on a Train is a 1951 American psychological thriller film noir produced and directed by Alfred Hitchcock, and based on the 1950 novel of the same name by Patricia Highsmith.  It was shot in the autumn of 1950 and released by Warner Bros. on June 30 the next year.  The film stars Farley Granger, Ruth Roman and Robert Walker, and features Leo G. Carroll, the director's daughter Pat Hitchcock and Laura Elliott.  The film is number 32 on AFI's "100 Years... 100 Thrills".

With (novel): With is a novel published in 2003 by the American author Donald Harington.  The story takes place in Stay More, Harington’s mythical town in Newton County, Arkansas.  "With" is part love story and part survival story about a girl’s development into a woman while living in isolation and seclusion from the rest of society.

Patricia Highsmith: Patricia Highsmith (January 19, 1921 – February 4, 1995) was an American novelist and short story writer, known for her psychological thrillers, which led to more than two dozen film adaptations.  Her first novel, "Strangers on a Train", has been adapted for stage and screen numerous times, notably by Alfred Hitchcock in 1951.  Highsmith wrote 22 novels, including her series of five novels with Tom Ripley as protagonist, and many short stories.  Existentialism is the literary movement that most influenced her writing, with "Dostoyevsky and Gide through Camus and Sartre" among her favorite authors.  Graham Greene described Highsmith as "the poet of apprehension rather than fear.  Fear after a time...is narcotic, it can lull one by fatigue into sleep, but apprehension nags at the nerves gently and inescapably."  Published under the pseudonym of "Claire Morgan," Highsmith wrote the first lesbian novel with a happy ending, "The Price of Salt", republished 38 years later as "Carol" under her own name.

Strangers on a Train (novel): Strangers on a Train (1950) is a psychological thriller novel by Patricia Highsmith about two men whose lives become entangled after one of them proposes they 'trade' murders.  He then goes ahead and fulfills his end of the imaginary bargain, leading to fatal consequences for both.

Strangers on a Train (play): Strangers on a Train is a play written by Craig Warner and is based on the 1950 the novel of the same name by Patricia Highsmith.  The show made its West End and world premiere at the Gielgud Theatre on 19 November 2013, following previews from 2 November.

Donald Harington (writer): Donald Douglas Harington (December 22, 1935 – November 7, 2009) was an American author.  All but the first of his novels either take place in or have an important connection to "Stay More," a fictional Ozark Mountains town based somewhat on Drakes Creek, Arkansas, where Harington spent summers as a child.

Supporting paragraphs: Patricia Highsmith Donald Harington (writer)
Answer: Patricia Highsmith