Start with high-confidence historical ya europe books, then narrow by subgenre or adjacent topics.
Among the Red Stars
Gwen C. Katz
The Huntress
Kate Quinn
The Paper Girl of Paris
Jordyn Taylor
Mary and the Birth of Frankenstein
Anne Eekhout
Doomed Queen Anne
Carolyn Meyer
Ashes of Roses
MJ Auch, Mary Jane Auch
An Assassin's Guide to Love and Treason
Virginia Boecker
The Silver Blonde
Elizabeth Ross
The King's Shadow
Elizabeth Alder
The Bad Queen
Enter the Body
Joy McCullough
Isola: Reese's Book Club
Allegra Goodman
Everything Is Poison
The Sea Child
Linda Wilgus
Paradise
Joan Elizabeth Goodman
Tamar
Mal Peet
Dauntless
Dina L. Sleiman
Wrath Becomes Her
Aden Polydoros
The Steep and Thorny Way
Cat Winters
The Good Thieves
Katherine Rundell
The Unbinding of Mary Reade
Miriam McNamara
The Forgotten Sister
Nicola Cornick, Kristin Atherton