Caldwell, Christi. Wantons of Waverton #1

"Widowed Lady Sylvia Elton is out to save young ladies from the terrible fate of love and marriage. Her former husband has retained his reputation as an honorable and loving man in death, but Sylvia has privately mourned his lies and infidelity. Joined by two equally scorned and cast-off friends, Sylvia establishes the Mismatch Society. With each new liberated member, the scandalous circle wreaks havoc on the romantic prospects of London's frustrated male peerage. But nothing prepares Sylvia for the Viscount St. John, a familiar face and her most formidable challenger."--Provided by publisher