Marianne and Willoughby find themselves falling in love while Colonel Brandon is called away on urgent business. Elinor is relieved when Edward comes to visit, but his strange behavour leaves her confused. Elinor learns that Edward is engaged to Lucy Steele, while Marianne discovers the full extent of Willoughy's betrayal from Colonel Brandon and it leaves her in a downward spiral and her health takes a turn for the worse.
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