Transplanted to Europe from her native America, Isabel Archer has candour, beauty, intelligence, an independent spirit and a marked enthusiasm for life. An unexpected inheritance apparently gives her freedom, but despite all her natural advantages she makes one disastrous error of judgement and the result is genuinely tragic.

The narrator is a young governess, sent off to a country house to take charge of two orphaned children. She finds a pleasant house and a comfortable housekeeper, while the children are beautiful and charming. But she soon begins to feel the presence of intense evil.