After traveling to Washington to receive a commendation before Congress for foiling a plot to assassinate President Ulysses S. Grant, Breanna Baylor is recruited to help out on an 'orphan train' carrying children to adoptive families out West. As they travel, a special bond forms between Breanna and three of the children, whom she leads to the Lord. But when Jared, Susan, and Nathan are faced with a terrible new threat their very survival depends upon Breanna, just as her life depends on them.