Tilda Cobham-Hervey is joining Dev Patel and Armie Hammer in Hotel Mumbai, a film about the 2008 attacks on the Taj Mahal hotel.
The script was co-written by Hopscotch's John Collee (Happy Feet, Master and Commander) and South Australian Anthony Maras, who will direct.
The four-day siege on the hotel killed 160 people, with many more injured.
As first reported by THR, Basil Iwanyk is producing through his Thunder Road banner alongside Arclight's Gary Hamilton and Mike Gabrawy.
Andrew Ogilvie and Julie Ryan will also act as producers, with Kent Kubena and Jonathan Fuhrman executive producing.
Cobham-Hervey broke out in Sophie Hyde's 2013 feature 52 Tuesdays, and had a small role in Rosemary Myers' Girl Asleep, which premiered at Adelaide Film Fest last year before world premiering at the Berlinale.
She's repped by CAA and Australia's United Management.