Based on the book "Diana: Her Last Love," by Kate Snell, "Diana" centres around the last two years of the princess's life. Following her divorce from Prince Charles in 1996, Diana (Naomi Watts) starts dating Hasnat Khan, a successful heart surgeon. The two date for two years until the pair ultimately split up in 1997 due to Hasnat's discomfort with the press's relentless hounding of Diana. After the breakup, Diana meets and subsequently dates Mohamed Al Fayed in July 1997, though their relationship comes to a tragic end when they are both killed in a car accident a month later.