A Masked Deception

Signet Regency, 1985, ISBN 0-451-13405-2

Margaret, the new Countess of Brampton, is a quiet, demure, dutiful wife by day, an alluring, masked charmer by night. Will Richard, Earl of Brampton, ever discover that the wife he is growing to love and the seductress he finds almost impossible to resist are one and the same?

A Masked Deception by Mary Balogh