Dr. Maud Biggin is an historian and archeologist who rents Green Knowe for the summer with Miss Sybilla Bun. The two of them send for Maud's niece and children from the Displaced Children Society, to care for for the summer. Maud Biggin is kindly, studious, and brilliant. She is seen originally as cold and distant, but throughout the summer, the children warm up to her.
Dr. Biggin is also a member of an archeological society, at which she presents a giant's tooth as evidence, and is labeled a fraud. Hoping to make her feel better, the children bring her to the circus to see Terak the Giant, but Dr. Biggin dismisses Terak as a circus trick.
