Erin is desperate for revenge.

As she discovers all she's capable of, she's pushed toward conflicting sets of values and drawn to someone untouchable. More secrets and history of the Sanguans and Spectavi could shed new light on Erin's mysterious past, teach her about the present, and change the course of the war.

Picking up the moment after the conclusion of Alone, Lion is Erin's quest for vengeance and her struggle to decide what's right, what's wrong, and who she wants to be.