As Sure as the Dawn by Francine Rivers

This is the 3rd and final instalment in the 'Mark of the Lion' series. Artretes, the German warrior and gladiator slave. When he learns of the existence of his son, given away by the child's mother, Julia, Atretes lover, he vows to find the boy and reclaim him. Hadassah, the central character of the first 2 books, is living with the surgeon who saved her life, as hi assistant and is gaining a reputation as a miracle worker. 

Julia is sick and Marcus, her brother, increasingly in love with Hadassah but not knowing where she is, is struggling with his conscience over his hedonistic lifestyle.

Eventually Artretes finds his son but is thwarted in in his attempts at reclaiming him by the boy's foster mother, Rizpah, a Christian widow. Concerned for his son's future and home-sick for the family and friends left behind in Germania, he begins the long journey home, taking Rizpah with him and accompanied by a Christian, retired, Roman Centurian, Theophilus.

On their long journey, Artretes is exposed to the Christian teachings of his companions and gradually grows in faith, But he's headstrong and impulsive and his young faith is tested when the little party arrives at Artretes home village. 

Can Artretes hang on to his faith? Will he abandon it or will Jesus' influence in his life grow and strengthen? Will Julia and Marcus be reunited? Will Julia be able to make amends and find forgiveness for her selfishness and wrongdoing? 

The climax to the story of Marcus, Julia, Artretes and Hadassah, together with Rizpah, Theophilus and all the other characters in this story, flows into a future of faith, strength and following the path set by God and not by selfish desires. As inspiring story and, even for non-Christians, a lesson in morality and the art of good living.

"As Sure as the Dawn" is published by Tindale Fiction