War of the Networks — Katie Cross

Never Underestimate the Power of a Desperate Witch With the Central Network entrenched in war and teetering on the brink of destruction, eighteen-year-old Bianca Monroe is determined to defeat Mabel's powerful Almorran magic by finding the Book of Light. During an attempt to save a burning orphanage, Bianca finds herself caught in a trap. Mabel kidnaps her, taking her to the hot sands of the Western Network where things are not as they seem. Mabel is more dangerous-and unhinged-than she's ever been before. War of the Networks is the fourth and final book in the thrilling fantasy collection The Network Series. It's a gripping tale about compassion, forgiveness, and surviving against all odds.