The five Bennet sisters are trucking along being poor and single when three strangers start stirring up feelings: Mr. Bingley, who Jane falls in love with; Mr. Darcy, who Elizabeth falls in hate with; and Mr. Wickham, who is T-R-O-U-B-L-E.
Mr. Darcy falls in love with Elizabeth despite her embarrassing family and despite that fact that he totally broke up Mr. Bingley and Jane. After Elizabeth forcefully rejects him, he writes her a letter explaining that she's basically 100% wrong about him. Just when things look like they might be picking up, Lydia's ridiculous elopement puts everyone's reputation in danger.
Darcy fixes things between Lydia and Wickham so he and Bingley can finally propose to the older Bennet sisters. Sweet! It's all good from here on out.