In the Bedroom Starter Kit

Todd Field’s Academy Award nominated 2001 film In the Bedroom adopts Andre Dubus’ 1979 short story "Killings" for the big screen. Since Dubus’ story about a father seeking vengeance for his son’s death is only thirteen pages long, Field and co-screenwriter Robert Feistinger faced the challenge of fleshing out the original tale in order to become a 2 hour + motion picture. [Thesis statement here.]

Possible Thesis Statements (to follow the introductory paragraph above). Use or amend as desired.

They largely succeeded, giving us a film that remains substantially faithful to the original short story.
In so doing, In the Bedroom departs dramatically from the original story.
In the process each of the main characters—Matt Fowler (Tom Wilkinson), Ruth Fowler (Sissy Spacek), Frank Fowler (Nick Stahl), Natalie Strout (Marisa Tomei), and Richard Strout (William Mapother)—undergoes distinct [or subtle--choose one] changes from the original story.
In the process the original story’s key conflicts and themes undergo distinct [or subtle--choose one] shifts.