Count de Faber is working on a new type of explosive, but finds out that Professor Plussman has beat him to it. After an unsuccessful attempt to acquire the formula from Plussman, he breaks into the professor's house, steals the formula, and kidnaps his daughter, Mary. He takes her to Carlsten Fortress.
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The wealthy hat maker Cederström has two daughters, Marianne and Lotte. He has decided that Marianne should marry Melander even though she loves the poet Malm. Lotte on the other hand loves Melander.
