'Cassie endures her darkest days under the rule of Balthazar in order to save the people of the frozen lands. She finds a passage into the high tower, and comes face to face with the shadowy being whose presence has haunted her since her first day at La Falaise – and she makes an immense and horrifying discovery.
'At the museum, the last survivors of a bleak existence are barely holding on. And the strange Order of Sister Celia make a chilling decision.
'Someone very close to Ethan once told him: “When we can fight, we will fight, and when we can no longer fight, we will endure.”
'It is time to fight.'
Source: Publisher's blurb.