It is a historical fiction that takes place during 1861, during the American Civil War.
16-year-old Sarah Louisa Wheelock lives on a farm near a small village in Michigan in the 1860s.
Instead, she runs away to Flint, Michigan to stay with an aunt, and then ships out with the First Union Greys to fight in the Civil War as a man.
After she is discovered to be a girl, she continues to work for the Union-spying on Rose O'Neal Greenhow.
[1][2] This novel takes many of its plot points from the life of Sarah Emma Edmonds.