Serafina and the Black Cloak is fantasy novel in historical fiction setting written by Robert Beatty.
Explanation:
This novel is about Serafina, a young adult who along with her friend is trying to find a man in the Black Cloak who is responsible for the disappearance of many people in the neighborhood.
The story of the protagonist and the antagonist eventually becomes an ideological one however as the antagonist's motivations are cleared.
While Serafina is towards the lawful side of things, the antagonist believes that chaos can be an instrument for the pursuit of truth.