The casting of Dimple Kapadia, Aaron Taylor-Johnson, Clémence Poésy, Michael Caine, and Kenneth Branagh was announced as filming started. Kapadia's screen test was put together by director Homi Adajania while working on his 2020 film Angrezi Medium. Caine was only given the pages from the script that included what was filmed on his one day of work. Branagh rescheduled production on his own directorial venture Death on the Nile (2022) to take his part, claiming to have studied the manuscript more times than any other in his career. Himesh Patel joined the production in August. Martin Donovan 's inclusion was revealed in the first trailer for the film.