The Widow's War — Mary Mackey

In 1853, Carolyn Vinton is left alone and pregnant after her fiance, abolitionist doctor William Saylor, disappears. After his stepbrother convinces her that William is dead, Carolyn accepts his offer of marriage, not realizing that she is being drawn into an elaborate ruse by her new husband and his father, a pro-slavery senator -- and that William is still alive.

Their passionate reunion takes place in the midst of the violent Civil War, as abolitionists and pro-slavers battle over the Kansas Territory. Now only their willingness to sacrifice their lives for their beliefs -- and for each other -- can save them.