Who Loves Whom?

Jane Cavenhurst is in love. To Mark Wyndham, the man betrothed to her sister! Not only that, she is being blackmailed and facing financial ruin. Only Mark can help her, but in doing so will he realise his true feelings for Jane, or will it be too late for both of them...
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Jane had broken her engagement to Harry Hemingford after his scandalous behaviour. But now he's back, just when Mr. Allworthy proposed? Allworthy was undoubtedly a good match, but had Jane ever really fallen out of love with Harry? And what would society say if she followed her heart?