It's a new term at Coal Hill Academy, and students are preparing for their Autumn Prom. But when the school comes under attack, four alienated students must form an unlikely alliance to defeat them. And this incursion is only the beginning... Charlie, April, Ram and Tanya, assisted by their physics teacher Miss Quill, are charged with a great responsibility by the mysterious alien known as the Doctor: guard against the creatures of nightmare that want nothing more than to find a way through to Earth and take it for their own.

Following the tragic events at the Prom, a devastated Ram isolates himself from the other three as he struggles with his new reality. Desperate to hold himself together on the football pitch, when he thinks he witnesses someone getting skinned alive he's convinced he's cracking up. But when Tanya, Charlie and April are all confronted with the same thing: a horrific, monstrous, skin-peeling dragon, they know that they're under attack. The gang must pull together to fight against the monster, and try to keep Coal Hill safe.

London is infiltrated by an eerie alien and the team must battle to save Tanya.

April starts to feel effects of sharing her heart with Corakinus, and his attempts to sever the attachment only make it stronger. When April's estranged father makes a startling appearance she confronts him with Shadow Kin force, manifesting traits of the Shadow Kin leader. Frightened by this extraordinary new-found power, April seeks comfort in Ram, and vows to reclaim her heart as her own. Meanwhile, something strange is happening to the others - London is slowly being infested with unusual, sinister flower petals.

April must confront Corakinus as the others try save the Earth from extinction.

Trapped in detention, dark truths emerge and fractures form in the friendship group.

With the gang trapped in detention and out of the way, Miss Quill accepts Dorothea's astonishing offer: to help remove the Arn from her head, and to reclaim her freedom. Alongside Ballon, an imprisoned shape-shifter, Miss Quill travels in a metaphysical engine and is taken to impossible, extraordinary and dangerous worlds, collecting materials in preparation for her life-changing procedure. After an emotional encounter with her surgeon and a nearly-fatal operation, Miss Quill must find a way to return to Earth: transformed and ready for war.

Facing an impossible choice, our heroes must use all they've learnt to save Earth. But how far are they prepared to go? And will they have to pay a price? Unable to recover from the truths they have faced, the gang has splintered. Liberated from enslavement, Quill prepares to take her revenge. But they must reunite when the Shadow Kin return, raging a ruthless, unrelenting war. Resolute to claim April's heart and Charlie's weapon, Corakinus threatens tohug their families until he has what he desires - and the friends must fight to prevent him. This time, not everyone will make it out alive.