Milly Theale's loyal traveling companion. She accompanies Milly and Kate to Venice. Later, she visits Merton in London and inadvertently exposes Kate's secret betrayal to Lord Mark, playing a crucial role in the scheme's collapse.
Their shared travel places Susan close to Kate's secret plan and its consequences.
Kate travels to Venice with Susan and the wealthy heiress after being invited to join their European trip.
Susan becomes an important messenger during the collapse of Kate's scheme.
After returning to London, Merton receives a visit from Susan, during which he realizes that Kate's secret has been exposed.
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