The Roar is nearly upon the thousands of children who have been drawn to the small, dank town of Coldharbour. The children are not quite sure what the Roar is, but they know it is an enemy to all.

They are prepared to battle, led by six children with superhuman skills, including winged Milo, whose skin has worn away to reveal an armor of silver and who has risen into the sky to protect them.

But the children are not alone. Buried deep under the ocean, the Roar's arch nemesis withers away. Will they be able to rescue it before it's too weak to help? They need all the help they can get―the Roar is bringing her offspring, and they are hungry for a fight.