RogueInRedVelvetThe Emperors of London, book 1

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If Connie loses her standing in society, she loses everything. Except Alex.

When country widow Constance Rattigan finds herself in a notorious London brothel instead of at the altar, only one person can save her from the auction block. Alex Vernon walked away from Connie once before, when he discovered she was engaged. Now that her fiancé has betrayed her, Lord Ripley doesn’t intend to leave her again.
He’ll marry her. But Connie has other ideas… She won’t marry him until her name is cleared.
Alex decides to make Connie’s wishes come true, but it’s not that easy, even with the help of his powerful relatives, known as the Emperors of London.