Robert's Letters is the name assigned on this wiki to the portions of the film that involve Robert Frobisher, Vyvyan Ayrs and Jocasta Ayrs.
The tale in the film is based on Letters from Zedelghem in the novel with the following differences:
- The character of Rufus Sixsmith appears. (In the novel, Frobisher describes having seen Sixsmith but it is unclear whether he actually saw him.)
- Frobisher's disinheritance by his father is omitted.
- Frobisher flees to Scotland instead of Belgium.
- The character of Eva Ayrs is omitted.
- Jocasta is presented as being younger than she is in the novel.
- Tadeusz Kesselring is substituted for Tadeusz Augustowski.