Silver book by Chris Wooding

The final exam is survival.

PAUL is the new kid at Mortingham Boarding Academy, and he has a dark secret.

CAITLYN admires Paul from afar and resents that he only has eyes for Erika.

ERIKA thinks that she and Caitlyn are best friends, but she's wrong

ADAM is a bully with a major chip on his shoulder

MARK is outgrowing his old friends but doesn't know how to make new ones.

In a few short hours, none of this will matter.

Without warning, a horrifying infection will spread across the school grounds, and a group of students with little in common will find themselves barricaded in a classroom, fighting for their lives

Some will live.
Some will die.

And then it will even get worse.