Once a thief, Briar now wields the magic of all green and growing things. On a journey east, he encounters a girl - Evvy - who reminds him of his younger self. She too is a wily street rat, with a power she barely understands. But, when Briar attempts to help her, he finds himself embroiled in a war between rival street gangs. Who is the mysterious noblewoman behind this power struggle? And, what does she want with Evvy?