When a dirty trick backfires and two girls vanish into thin air, Ruben is terrified because it’s all his fault - even if he doesn’t know how he did it. Thomas has a few ideas, and he’s quietly confident that he can solve this wonderful new puzzle. But Mrs Abbott’s acting weird and Mr Bromble really isn’t himself; and though the mystery begins in the Principal’s office, it will take four children on a perilous journey to a galaxy far far away … but then again, maybe it’s just some local binary system. Can four mismatched children - the teacher’s pet, the class bully, the outcast nerd, and a girl who just loves flying - overcome their differences, rescue their teachers, retrieve one of their own, and make it back in time to save their classmates?