Mental (2021)

Dmitry, who has a high-paying white-collar job, is psychotic, a secret which is safe with his therapist. Dmitry's boss would be totally surprised to learn that the man's best financial forecast moves were guided by the voices in his head. Dmitry has several voices, each seeming to be 100% real, each with its own personality and ambitions. To stay sane, Dmitry must constantly keep his imaginary population at bay and keep new characters from settling in. The permanent inhabitants include Dmitry's ex-wife and her lover--both found dead in their bed. Dmitry sets out to find their murderer in order to get rid of them, and to win back his sanity and custody of his son.