What to read after H.I.V.E. (Higher Institute of Villainous Education)?

H.I.V.E. (Higher Institute of Villainous Education) is a top-secret school of applied villainy where children with a precocious gift for wrongdoing are sent to develop their talents into criminal mastermind. After all, 'villains have the best lines and wear the best costumes'. One small catch is that the children cannot leave until training is complete, six years later. With villainy comes a certain freedom of thought, and every year one student in particular will show exceptional talent - after all, it takes the best to produce the worst. This year there are two students: Otto Malpense and his new friend Wing Fanchu are both exceptionally bad, and they are definitely not keen on being held against their will for six long years . . .