Suggestions by @modern_remaker

Benedict Cumberbatch

as Inspector James Japp in Hercule Poirot And The Mysterious Affair At Styles

Alicia Vikander

as Evelyn Howard in Hercule Poirot And The Mysterious Affair At Styles

Dylan O'Brien

as Lawrence Cavendish in Hercule Poirot And The Mysterious Affair At Styles

Nicholas Hoult

as Alfred Inglethorp in Hercule Poirot And The Mysterious Affair At Styles

Joey King

as Cynthia Murdoch in Hercule Poirot And The Mysterious Affair At Styles

Sophie Turner

as Mary Cavendish in Hercule Poirot And The Mysterious Affair At Styles

Helena Bonham Carter

as Emily Inglethorp in Hercule Poirot And The Mysterious Affair At Styles

Michael Fassbender

as John Cavendish in Hercule Poirot And The Mysterious Affair At Styles

Daniel Radcliffe

as Lieutenant Arthur Hastings in Hercule Poirot And The Mysterious Affair At Styles

Jack Black

as Hercule Poirot in Hercule Poirot And The Mysterious Affair At Styles