Unraveller

Unraveller is a dark YA fantasy about learning to use your power and finding peace, from award-winning author Frances Hardinge.
 
In a world where anyone can create a life-destroying curse, only one person has the power to unravel them.
 
Kellen does not fully understand his talent but helps those transformed maliciously—including Nettle. Recovered from entrapment in bird form, she is now his constant companion and closest ally.
 
But Kellen has also been cursed, and unless he and Nettle can remove his curse, Kellen is in danger of unravelling everything—and everyone—around him . . .
 
“Brilliantly developed world. Kellen and Nettle are both memorable from their first introduction. As always, Hardinge is masterful at her ability to write poignant, thoughtful passages while also ably developing an expansive fantasy world that is believable and relatable.” —Bulletin of the Center for Children’s Books (Starred Review)