A Heart's Obsession, Journey of the Heart Series by Colleen Coble and published by Thomas Nelson.
When her father succumbs to a long illness, Sarah Montgomery is freed from duty to family. At last she can be with the love of her life, Rand Campbell, who has gone out west to Fort Laramie, Wyoming. Sarah and her younger brother Joel make the arduous journey filled with hope.
But at Fort Laramie, the reception Sarah meets isn’t what she had hoped for. Her friend Amelia is thrilled to have her, but Rand seems to be in the clutches of Jessica DuBois, the scheming daughter of the post commander.
Sarah resolves to remain at Fort Laramie and try to win Rand back. But things will get tougher before they get easier . . . especially when her ex-fiancé Ben Croftner arrives in Wyoming, obsessed with having her back in his arms.