A man struggling to save the life of another finds himself drawn into a strange netherworld he didn't know existed in this stylish thriller. Sam Foster (Ewan McGregor) is a psychiatrist living in New York City with his girlfriend, Lila Culpepper (Naomi Watts), who was once one of his patients. However, it's another one of his patients who becomes the focus of his obsessions when Henry Letham (Ryan Gosling), a disturbed young man whom Foster took over from a colleague, announces during a session that he intends to commit suicide in three days, on his 21st birthday. Sam takes the threat quite seriously and tries to track down Henry, who seems to have disappeared. Sam speaks to a number of Henry's friends and acquaintances -- his mother (Kate Burton), the man he claimed was his father, Dr. Leon Patterson (Bob Hoskins), a waitress who regularly served Henry at the coffee shop where she works (Elizabeth Reaser), and his former therapist Dr. Beth Levy (Janeane Garofalo). As Sam talks to people in Henry's circle, he finds he's learning more about himself than the man he's supposed to save, and he begins to drift into an emotional netherworld where the supposedly dead and the living cross paths. Stay was directed by Marc Forster, who had previously enjoyed breakthrough hits with two very different films, Monster's Ball and Finding Neverland.
by Mark Deming synopsis