Wren is in the last place she ever wanted to be: back inside the dome. Held as a prisoner of her father, the Master General Enforcer, she is completely cut off from the outside. After a harrowing escape attempt, and finding Levi trapped in a cell, Wren's world is further turned upside down by what could be Pace's ultimate betrayal. Only Pace's whispered words keep her from losing all hope. "Things are not always what they seem." Those words, along with the sight of yellow-feathered Pip keep Wren fighting for what she knows in her heart is right for everyone. She must break the glass.

When Wren's father realizes that his rebellious daughter and her friends are not falling into his plan of complacency, he turns them over to an even darker enemy. While Levi is certain his uncle will save them, the Quest and all their friends outside the dome seem to have disappeared.

The outside world is a brutal place, but Wren will not be beaten. She holds strong to her belief that outside the glass there is the promise of freedom and the hope for love. Wren must battle the forces that want to enslave her, and the foolish whims of her own heart to free her world and finally find where she belongs.