Each of Francine Rivers books is incredible. This series is really 2 Christian historical fiction stories. In A Voice in the Wind we meet Hadassah and other characters in this story set in the first century. An Echo in the Darkness concludes the story. The story told in these 2 books is a MUST READ. Even people who just aren't readers have read this story and LOVED.
As Sure as the Dawn is a spin-off of the other story, only related by 1 minor character.