Keeping The Castle by Patrice Kindl

Seventeen-year-old Althea is the sole support of her entire family, and she must marry well. But there are few wealthy suitors–or suitors of any kind–in their small Yorkshire town of Lesser Hoo. Then, the young and attractive (and very rich) Lord Boring arrives, and Althea sets her plans in motion. There’s only one problem; his friend and business manager Mr. Fredericks keeps getting in the way. And, as it turns out, Fredericks has his own set of plans . . .

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