Trial by Poison: Mary Slessor (Trailblazer Books #12)
Dave and Neta Jackson are a full-time husband/wife writing team who have authored and co-authored many books on marriage and family, the church, relationships, and other subjects.  Their books for children include the TRAILBLAZER series and Hero Tales, volumes I,II, III, and IV.  The Jacksons make their home in Evanston, Illinois.