Arch Enemy [Looking Glass Wars #3] by Frank Beddor

The Heart Crystal’s power has been depleted, and Imagination along with it. The people of Wonderland have all lost their creative drive, and most alarmingly, even Queen Alyss is without her powers. But at least the vicious Redd Heart seems to be similarly disabled. Amazingly, she is attempting to team up with her enemy, Alyss, in order to reclaim Wonderland from King Arch. Alyss might have no choice but to accept Redd’s overtures, especially when she begins to receive alarming advice from the caterpillar oracles…