This series begins in book 5, Sparks in Spearfish, of the Seven Brides of South Dakota series.

However, you don’t need to read that book to jump right in with book one.
The Brothers of Belle Fourche is a novella series set in pioneer South Dakota.

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Books 2 in the Brothers of Belle Fourche series, What the Heart Holds

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Amazon US
Amazon International
Ibooks
Nook
Kobo