Mastermind (2026): Cast, Story and Release Details

Prepared by Movies Dock Editorial

Mastermind follows investigator Mozi after a suspect vanishes from a police detention compartment and later turns up dead inside headquarters archives. With evidence linking the killing to Mozi’s own service weapon, the case becomes a dangerous puzzle involving hidden criminals, locked rooms and conflicting clues.

Mastermind is a 2026 crime-action film directed and written by James Hung. The China-Hong Kong production stars Louis Koo as Mozi, an investigator drawn into a baffling case involving a vanished suspect and a fatal shooting inside police headquarters.

Its premise centers on a chain of seemingly impossible movements: a fugitive disappears from a detention compartment, appears in the headquarters archives, and is then found dead in a locked warehouse. As the investigation develops, Mozi faces evidence that places him at the center of the case.

Mastermind movie details

Story without spoilers

A suspect mysteriously disappears from the detention compartment at Dongcheng Police Station. Agent Mozi works to trace the fugitive, but the investigation initially produces no clear answers. The case takes a sharper turn when the missing suspect is reported inside the archives of the city’s police headquarters.

The criminal is eventually found shot in the chest inside a locked warehouse. Experts determine that the bullet came from Mozi’s police gun, making him the principal suspect. Mozi must confront the disappearance, the unexplained movement between restricted areas and the complicated background surrounding the dead man, while trying to separate reliable evidence from misleading clues.

What to expect

Mastermind is built around a crime investigation with an action component. Its central mystery involves a missing detainee, restricted police locations, a locked-room killing and forensic evidence that points toward the investigator himself.

The premise suggests a plot driven by questions of access, identity and conflicting evidence rather than a straightforward pursuit. The film’s supplied genre information supports expectations of police investigation and action-focused criminal intrigue, while the synopsis keeps the central explanation deliberately concealed.

Cast and creative team

Louis Koo leads the cast as Mozi, also identified in the credits by the character name 計子默. Ci Sha, Simon Yam, Amy Lo Wai-Man, Ben Yuen Foo-Wah, Cheung Siu-fai, Jeffrey Ngai, Yeung Wai-Lun and Gardner Tse Kwan-Ho are also credited in the cast.

James Hung serves as both director and writer. The production companies are Hishow Entertainment, Damai Entertainment, 华文映像影视传媒有限公司 and Mei Ah Entertainment.

• Louis Koo as 計子默
• Ci Sha
• Simon Yam
• Amy Lo Wai-Man
• Ben Yuen Foo-Wah
• Cheung Siu-fai
• Jeffrey Ngai
• Yeung Wai-Lun
• Gardner Tse Kwan-Ho

Release and production context

Mastermind is listed as a 2026 release, with a release date of October 1, 2026. It is classified as a crime and action film and is associated with China and Hong Kong. No runtime or spoken-language information is supplied.

Production companies: Hishow Entertainment, Damai Entertainment, 华文映像影视传媒有限公司, Mei Ah Entertainment

Movies Dock view

With its police-station disappearance, locked-warehouse killing and weapon evidence implicating the lead investigator, Mastermind is positioned as a crime mystery with an action framework. The available synopsis establishes the questions at the heart of the story while leaving the case’s full explanation for the film itself.

Film data:
TMDB