Trial By Fire by Becca Higgins, B. B. Griffith, Julia Kuo
This second installment of The Morningstar Series opens with Silla on the run and danger in hot pursuit. She has one goal in mind, rescuing her baby brother from the clutches of the evil Voice. If she ever hopes to succeed, she'll have to turn to creatures as wild as the forest itself for help.
Becca Higgins was born in the US, but her mind constantly wanders the secret forests of the world. She sees magical things most people don't see, and one day she decided she wanted to tell others.
B. B. Griffith was sitting at his desk when he received a tattered letter from Becca Higgins about the world she sees. He asked her if he could tell her story, and after a time she agreed. When he's not writing or editing he can often be found sitting on park benches and patios, looking about.