If you like The Pale Assassin and historical fiction, you might like these:
The Red Necklace by Sally Gardner
In the late eighteenth-century, Sido, the twelve-year-old daughter of a self-indulgent marquis, and Yann, a fourteen-year-old Gypsy orphan raised to perform in a magic show, face a common enemy at the start of the French Revolution.
The Stolen One by Suzanne Crowley
After the death of her foster mother, sixteen-year-old Kat goes to London to seek the answers to her parentage, and surprisingly finds herself invited into Queen Elizabeth's court.
The Luxe by Anna Gobseren
In Manhattan in 1899, five teens of different social classes lead dangerously scandalous lives, despite the strict rules of society and the best-laid plans of parents and others.