When Horrid Henry gets nits, and his little brother Peter Perfect doesn't, he makes sure that everyone esle gets them too. After that, he can turn his attention to sabotaging the school trip, ruining his parents' dinner party, and terrorizing Peter...
Trouble is brewing at the Varmint Theater! Before he knows it, watchmaker mouse Hermux Tantamoq finds himself not only hired to track down a mysterious blackmailer, but roped into designing the set...