The Marquise of O

In 1799, a virtuous widow, the Marquise von O, finds herself pregnant and protests her innocence in an unusual test of gratitude after being saved by a Russian Count who reunites her with her daughters during a Napoleonic War attack on her family's citadel. The Count later returns, insisting on marrying her, but she refuses until she publishes her original announcement, which is answered by an anonymous suitor claiming to be the child's father, leading to a series of events that test her innocence and ultimately reveal her true intentions.