Caden's brother Aiden is many things: clever, powerful, vindictive. Unforgiving. And now, he's also mysteriously free from the hellish dimensional prison that Caden had trapped him in. Caden is sure that Aiden is out for revenge, but since his parents refuse to see the danger when it comes to his brother, he'll have to find a way to survive on his own.

Meanwhile, Rae, freed from the threat of the eye-snatching, monstrous Unseeing, has once again turned all her focus toward finding her missing father. She believes the town's shady alternative energy company, Green On!, might have the information she seeks, so she joins their internship program to get answers. Unfortunately, this means sacrificing her friendship with Caden, who wants nothing to do with Green On! or anyone associated with it.

When a special assignment from Rae's internship leads her to uncover an infestation of giant, flesh-eating centipedes that may be alien in nature, she needs to convince Caden to help her get rid of them. The two friends must learn to work together again, because this time, it's not just Whispering Pines's fate that hangs in the balance, but the world's.