Matt followed Cas’s gaze to the table diagonally in front of her and saw a boy make a heart with his hands, he wasn’t smiling as he cracked his hands apart and Matt saw how Cas leant her head on her desk and hit her head over and over again.

When Cas stood up to go to her next lesson, only Matt realized the wet patch she had left where her head had been and the faint streak of mascara running down her cheek. He followed her out into the corridor and lost sight of her in the sea of peopl...