We are in an epidemic. An epidemic of unhappiness. … Friends, here is the good news: HappyHead has the answer. When Seb is offered a place on a radical retreat designed to solve the national crisis of teenage unhappiness, he is determined to change how people see him and make his parents proud. But as he finds himself drawn to the enigmatic Finn, Seb starts to question the true nature of the challenges they must undergo. The deeper into the programme the boys get, the more disturbing the assessments become, until it's clear there may be no escape... The first in a thrilling, thought-provoking new series for fans of They Both Die at the End and Squid Game ‘So tense doesn’t quite cut it. It’s SO GOOD!’ – A.F. Steadman, author of Skandar and the Unicorn Thief‘Like Hunger Games but better' – Sue Wallman, author of Lying About Last Summer