Amari and the Night Brothers by B. B. Alston

When Amari Peters receives a mysterious invitation from her missing brother, she discovers a hidden supernatural world filled with magicians, mythical creatures, secret organizations, and dangerous conspiracies. As she begins training at the Bureau of Supernatural Affairs, Amari must prove that courage and determination matter more than expectations. Bursting with magic, mystery, humor, and unforgettable characters, this bestselling novel is perfect for fans of Harry Potter and Percy Jackson.