A stunning novella by a hot new talent in YA, in a gorgeous collectable edition. A brilliantly diverse cast of characters face heartbreak and home truths as they return to their old school and discover no one can ever truly go back. Four friends meet up at their old school to open the memory box they stowed there years ago – with five letters inside for four of them, because their friend Millie has died. When they open the box they find a new letter from Millie and discover that she has left them special instructions: permission to open her letter only if they all read aloud the letters they wrote to their older selves, revealing their deepest secrets.