The Daughters of the Faith series has been a great success for Moody so far with 120,000 copies sold. Courage to Run is the most successful, with sales of 39,000. Tinker's Daughter is the next highest, at more than 19,000. They are all continuing to grow.
There are a few elements of this series that separate it from many other children's book biographies. First, these books are about little girls. They are not biographies of the entire life of these characters- these are stories about girls who made a difference while they were still young. This enables the young girl readers to relate to the characters more than they would if these characters had to wait until they were thirty or forty before doing anything significant.
Second, these stories are faith journeys. Wendy gets inside the minds of these girls in order to portray their struggles to make God an active part of their lives.