Question: What 1955 novel written by Patricia Highsmith did William Horberg produce a film adaptation?

Context articles: Patricia Highsmith
The Two Faces of January
Hossein Amini
Purple Noon
The Price of Salt
The Cry of the Owl (2009 film)
Ripley's Game (film)
Deep Water (Highsmith novel)
The Talented Mr. Ripley (film)
William Horberg

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.
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'.
Hossein Amini (Persian: حسین امینی‎ ‎ ; born January 18, 1966) is an Iranian screenwriter and film director.
 Amini has worked as a screenwriter since the early 1990s.
 He was nominated for numerous awards for the 1997 film "The Wings of the Dove", including an Academy Award for Best Writing – Adapted Screenplay.
 He also won a "Best Adapted Screenplay" award from the Austin Film Critics Association for his screenplay adaptation of Nicolas Winding Refn's "Drive" (2011), based on the novel by James Sallis.
 For his directorial debut, he both wrote and directed "The Two Faces of January", an adaptation of the Patricia Highsmith novel.
Purple Noon (Original: Plein soleil) (Italian: "Delitto in pieno sole"), (aka "Full Sun", "Blazing Sun", "Lust for Evil" and "Talented Mr. Ripley"), is a 1960 French-Italian film directed by René Clément, loosely based on the 1955 novel "The Talented Mr. Ripley" by Patricia Highsmith.
 The film stars Alain Delon in his first major film, along with Maurice Ronet (as Philippe Greenleaf) and Marie Laforêt (as Marge); Romy Schneider appears briefly in an uncredited role as Freddie Miles' companion, and Billy Kearns (an expatriate American actor well liked in France) plays Greenleaf's friend Freddy Miles.
 The film, principally in French, contains brief sequences in Italian.
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 Cry of the Owl is a 2009 thriller film based on Patricia Highsmith's book of the same name.
 The American-British-Canadian-French-German co-production was directed by Jamie Thraves and stars Paddy Considine, Julia Stiles, and Karl Pruner.
 This is the third filming of the book after the 1987 French film adaptation by Claude Chabrol and a German TV adaptation titled "Der Schrei der Eule", also dating from 1987.
Ripley's Game is a 2002 thriller film directed by Liliana Cavani.
 It is adapted from the 1974 novel of the same name, the third in Patricia Highsmith's ""Ripliad"", a series of books chronicling the murderous adventures of con artist Tom Ripley.
 John Malkovich stars as Ripley, opposite Dougray Scott and Ray Winstone.
 Highsmith's novel was previously adapted in 1977 as "The American Friend" by director Wim Wenders, starring Dennis Hopper and Bruno Ganz.
Deep Water is a psychological thriller novel by Patricia Highsmith, first published in 1957 by Harper & Brothers.
 It is Highsmith's fifth published novel, the working title originally being "The Dog in the Manger."
 It was brought back into print in the US in 2003 by W. W. Norton & Company.
The Talented Mr. Ripley is a 1999 American psychological thriller film written for the screen and directed by Anthony Minghella.
 An adaptation of Patricia Highsmith's 1955 novel of the same name, the film stars Matt Damon as Tom Ripley, Jude Law as Dickie Greenleaf, Gwyneth Paltrow as Marge Sherwood and Cate Blanchett as Meredith Logue.
William Horberg is a Hollywood film producer, chair of the Producers Guild of America on the East coast, and guest curator at ArtYard.
 His films include Anthony Minghella's adaptations of the novels "The Talented Mr. Ripley" and "Cold Mountain".
 He also produced the critically acclaimed "Fallen Angels" series for Showtime from 1993-1995.