Darcie Desires a Drover

A historical romance set in 1873.  Darcie Robbins fled St. Louis to protect her two children from their bad father. Now divorced, she's temporarily working on the Bar E Ranch in central Kansas. She needs a permanent job—or a trustworthy husband—to help provide for her family.
Reuben Shepard went home to his family in New York after the Civil War, to find his wife had declared him dead—so she could wed another. In shock, Reuben didn't contest her claim and wandered south, spending years as a cattle drover on western trails until settling down to work on the Bar E Ranch.
Spending time with Darcie's toddler, Tate, makes Reuben miss his own son, Gabe. Reuben travels to New York, hoping to visit his son, and ends up bringing Gabe back to the Kansas because the boy's step-father had just died.
When Reuben proposes marriage to Darcie for their children's sake, the couple falls in love as they learn to trust and support each other while planning for their future. But their wedding is stalled when Reuben's former wife arrives, stating she and Reuben are still married. 
What's the truth and what's best for the children is their concern now instead of a wedding date. How can they clear the past so they can have a future together?