Used book – Cover Her Face, P. D. James

At Martingale, the beautiful country home of the Maxie family in rural England, they are tolerant enough to employ a single mother as a maid, who does not want to be separated from her child. But everything goes wrong when she wears the same dress as the daughter of the house... and announces her engagement to the "young master."

A murder is committed that very evening at the Maxie's. And Inspector Dalgliesh, specially appointed by Scotland Yard, is about to delve into one of the most disturbing cases of his career...