The screenplay is based on the Kate Snell's 2001 book Diana: Her Last Love, and was written by Stephen Jeffreys. Robert Bernstein and Douglas Rae are the producers of the movie for Ecosse Films. British-Australian actress Naomi Wattsplays the title role of Diana.
The biopic focuses on the last two years of her life after she divorced from Prince Charles. Her relationships with heart surgeon Dr. Hasnat Khan and Dodi Fayed are also narrated. It also provides the details about how the Princess and Khan met.