The whole gang is thrown into detention by Miss Quill. Locked in her classroom, they are terrified when an explosion propels them out of space and time: trapped, claustrophobic and floating in blackness with no way of escape.

Although a mysterious asteroid fragment may be their key to freedom, it forces the gang to confess their deepest, darkest secrets to one another. As ugly truths come out, fractures start to appear in the friendship group.

And then they make a chilling discovery. They're not alone. There's somebody in there with them.

HW