They Know

They Know
Directed byBill Hader
Screenplay byBill Hader
Story byBill Hader
Duffy Boudreau
Produced by
  • Bill Hader
  • Robert Graf
  • Alyssa Donovan
Starring
CinematographyCarl Herse
Edited byAli Greer
Music byDavid Wingo
Production
companies
CountryUnited States
LanguageEnglish

They Know is an upcoming American psychological horror film written by, directed by, and starring Bill Hader. The film is based on an original story by Hader and Duffy Boudreau. This film marks Hader's feature directorial debut.

Premise

A divorced father (Hader) grows suspicious that a mysterious man dating his ex-wife (Cardellini) is having a strange influence on their daughters (Lang and Mote).

Cast

Background

The film is based on an original story that Hader had conceived with longtime collaborator Duffy Boudreau. Hader initially wrote the script, described by Ari Aster as being "incredibly personal", after wrapping the final season of Barry. Hader struggled to find financing due to the "disturbing" and "cynical" nature of the script, and briefly shelved the project. He revealed that he was inspired to return to the project after watching Aster's 2025 film Eddington.

Production

Hader had previously directed 18 episodes of the HBO crime tragicomedy series Barry, which he co-created and starred in.

The film was financed by MRC. Hader and Robert Graf serve as producers under Hader's Hanarply banner, with Alyssa Donovan serving as co-producer.

Production began in Los Angeles on April 13, 2026, where it was announced that Linda Cardellini would be joining the cast as the ex-wife of Hader's character. On April 28, 2026, Lilou Lang and Lorelei Olivia Mote were announced to be joining the cast, playing the daughters of Hader's character. On June 9, 2026, Cardellini revealed that principal photography on the film had concluded.

References

  1. ↑ Lavallée, Eric (2026-07-19). "Bill Hader's 'They Know' - Everything We Know So Far … (American Indie Edition)". IONCINEMA.com. Retrieved 2026-08-22.
  2. 1 2 3 4 Grobar, Matt (February 19, 2026). "Bill Hader To Make Feature Directorial Debut With MRC Horror Film 'They Know'". Deadline. Retrieved May 16, 2026.
  3. 1 2 Grobar, Matt (April 28, 2026). "Lilou Lang & Lorelei Olivia Mote Join They Know Opposite Bill Hader (EXCLUSIVE)". Deadline. Retrieved May 16, 2026.
  4. ↑ Solomon, Daniel (April 17, 2023). "Bill Hader Wants To Direct A Movie After His Award-Winning Success On Barry". Screen Rant. Retrieved May 16, 2026.
  5. ↑ Bryant, Jacob (July 10, 2025). "Bill Hader Is Sitting On a Film Script That's 'Incredibly Personal,' Unsentimental: 'That's Why It's Been So Hard to Get It Made' | Video". TheWrap. Retrieved May 16, 2026.
  6. 1 2 Playlist, The; theplaylist (July 18, 2025). "Bill Hader Wrote a Horror Movie— A Producer Called It "Horrible"". The Playlist. Retrieved May 16, 2026.
  7. ↑ Grobar, Matt (April 13, 2026). "'They Know': Linda Cardellini Joins Bill Hader Horror Movie". Deadline. Retrieved May 16, 2026.
  8. ↑ Rizzo, Carita (June 9, 2026). "Linda Cardellini Talks 'DTF St.Louis' & 'Crystal Lake'". Deadline. Retrieved June 10, 2026.