Thoroughbreds is a 2017 American black comedy thriller film written and directed by Cory Finley in his directorial debut.

The film received positive reviews from critics, who praised the ambitious direction, screenplay, and performances, particularly from Cooke and Taylor-Joy.

In suburban Connecticut, upper-class high schooler Amanda euthanizes her crippled horse with a knife, resulting in charges of animal cruelty.

Lily denies being paid, but Amanda, who says that she does not experience emotions due to an unspecified mental disorder, is unfazed.

They decide instead to blackmail drug dealer Tim (who had previously been in jail for statutory rape) into murdering Mark while the two girls are out of town.

Lily attempts to back out of the plan, but Amanda, realizing a life spent without emotions is "meaningless," willingly finishes her drink.

The letter is shown to detail Amanda's life at the hospital, including a recurring dream about a future in which humans let the world fall into disarray due to their vanity, leading to it being overrun by thoroughbred horses.

The script, which Finley had expected to be produced as a stage play, was instead acquired for production as a film by companies B Story (Nat Faxon, Jim Rash, and Kevin J. Walsh) and June Pictures.

[5][7] Principal photography began on May 9, 2016,[8] in the Massachusetts towns of Cohasset, Tewksbury, Scituate, Westwood, and Wellesley,[9] concluding on June 5, 2016, 14 days before Yelchin died.

"[15] On Metacritic, the film has a weighted average score of 75 out of 100, based on 37 critics, indicating "generally favorable reviews".