She taught at a school for a year, then married Kenneth Landon, whom she knew from Wheaton, and in 1927 they signed up as Presbyterian missionaries to Siam (Thailand).
During her readings, she learned about Anna Leonowens, the 19th Century governess to the Siamese royal family of Mongkut (Rama IV).
Dr. Landon, as Washington's leading expert on Thailand, worked with the Office of Strategic Services and then with the Department of State to create the Free Thai resistance movement.
Landon charged the producers with "inaccurate and mutilated portrayals" of her literary property and sued for copyright infringement.
[3][4] The suit initially failed in late 1974, but after the judgment was appealed, the parties chose to settle out of court, and a settlement was reached in 1975 with which Landon was satisfied.