Oliver Gasper finds an ancient magazine with a 'disappearing' formula in it. Desperate to dodge a French test, he tries it out . . . and it works! The problem is, somebody's stolen the magazine and Oliver can't remember the words he needs to get back again. Fed-up with being trampled underfoot and trapped in bus doors, Oliver turns to Nicky Chew for help. Nicky's the most invisible visible boy in school, staying out of trouble so the teachers never notice him. Together they set out to find the missing formula. But will Oliver ever be seen again?