A Good Woman allows a glimpse into the privileged world of upper class Americans and Englishmen who spent their summers on the Amalfi coast during the 1930s. Mrs. Erlynne (Helen Hunt), skirting the edges of New York society, flirts with several men, arousing the jealousy of their wives, and is shunned from their circle. Looking elsewhere for a suitable target, she spots a newspaper photo of Lord Robert Windermere (Mark Umbers) and his young bride, Meg (Scarlett Johanssen). Mrs. Erlynne changes her identity and travels to Italy to insinuate herself into his social circle. She keeps fellow vacationers gossiping as she spends her afternoons with Mr. Windermere and is seen accepting money. Meanwhile, Lord Darlington (Stephen Campbell Moore) takes advantage of his best friend's absence and directs his attention to the na''ve Meg. Mrs. Erlynne is the subject of Lord Augustus' (Tom Wilkinson) affection and misperceptions and mistaken identities abound as the true nature of each character is slowly revealed.