Illuminations By T. Kingfisher

Rosa Mandolini knows in her heart that her family are the greatest painters of magical illuminations in the city. But the eccentric Studio Mandolini has fallen on hard times and the future is no longer certain.

While trying to help her family, Rosa discovers a strange magical box protected by a painted crow. But when she finds a way to open the box, she accidentally releases the Scarling, a vicious monster determined to destroy the Mandolini family at any cost.