Start with high-confidence christian historical stories books, then narrow by subgenre or adjacent topics.
The Brave Queen
M. J. Thomas
Flight of the Outcasts
Alister E. McGrath
The Knight at Dawn
Mary Pope Osborne
The Wind, the Road and the Way
Jenny L. Cote
Sent
Margaret Peterson Haddix
Suffer the Little Children
Al Lacy
Voyage With the Vikings
Paul McCusker, Marianne Hering
Hunt for the Devil's Dragon
Marianne Hering, Wayne Batson
Danger on a Silent Night
Marianne Hering, Nancy I. Sanders
The Redcoats Are Coming!
Trouble on the Orphan Train
Marianne Hering
Inferno in Tokyo
Kingdom's Dawn
Chuck Black
Kingdom's Hope
Kingdom's Edge
Kingdom's Reign
Kingdom's Call
