Angel in the Storm, Book 2 by Lisa Grace (Angel Series)

Fifteen-year-old Megan's younger brother Max has been kidnapped by Judas, an evil angel, who has sold him to a human trafficking ring working out of New Orleans. Judas is determined to destroy Max’s soul.
Framed for Max's murder, Megan, along with the help of Johnny who is a good angel, and her friends, must stay one step ahead of the police and an approaching hurricane in an attempt to save Max.