Emma's cascade of misreadings in Highbury
Emma Woodhouse persuades her protégée Harriet Smith to refuse the farmer Robert Martin, then misreads Mr. Elton's courtship of herself as courtship of Harriet, misses the secret engagement of Frank Churchill and Jane Fairfax, and invents a scandalous romance between Jane and Mr. Dixon. Each error comes out in turn: Elton proposes to Emma, Frank's engagement is revealed, and Harriet says she hopes to marry Mr. Knightley. That last revelation makes Emma realize she loves Knightley herself, and it ends her matchmaking.
