According to Deadline, Ezra Miller (Justice League and Fantastic Beasts) have been cast to star in ‘The Mourner.’
This will be the American adaptation of the Japanese novel by Arata Tendo. Caspter Kiriya will direct from the script of Robin Shushan.
You can read the synopsis of the film below:
The Mourner follows a jaded and embittered homicide detective on the trail of murderous sex traffickers, who discovers new spiritual meaning in her life when she comes across a mystical young man (Miller) whose calling in life is to mourn the dead who have no one else to mourn them. Tendo won the Naoki Prize in 2008 for the novel Itamu Hito (The Mourner). The book got a Japanese-language adaptation in 2015.