Ratchett's true identity is John Cassetti, Daisy's kidnapper and murderer. The shock of Daisy's death caused her pregnant mother, Sonia, to die after giving premature birth to a stillborn baby; her father, Colonel John Armstrong, was overcome with grief and committed suicide.

Kenneth Branagh's Murder on the Orient Express opened in November 2017 with a hearty $29 million domestic before legging out to $102 million in North America and (thanks to $34 million in China and $32 million in the United Kingdom) $355 million worldwide.

Murder on the Orient Express—the 1974 version, the 2001 remake with Alfred Molina as Poirot, the 2006 version with David Suchet as Poirot and now the 2017 one with Kenneth Branagh—are based on the 1934 novel by Agatha Christie.

Daisy's murder destroyed her family, killed her mother, drove her father to suicide, and resulted in Cassetti's death at the hands of the Armstrong family's remaining friends and relatives. That's the twist: Every suspect is responsible. They worked together to murder Cassetti and enact revenge.