Start with high-confidence historical europe books, then narrow by subgenre or adjacent topics.
The Entertainer and the Dybbuk
Sid Fleischman
The War I Finally Won
Kimberly Brubaker Bradley
Stepping on the Cracks
Mary Downing Hahn
The Bletchley Riddle
Ruta Sepetys, Steve Sheinkin
Lines of Courage
Jennifer A. Nielsen
Maria and the Plague
Natasha Bacchus-Buschkiel, Francesca Ficorilli
The Blackbird Girls
Anne Blankman
Oliver Twist
Charles Dickens