Horrid Henry and the Secret Club Published 1996

Horrid Henry gets an injection, torments his brother Perfect Peter, creates havoc at his own Birthday party and plans sweet revenge when Moody Margaret won't let him into her Secret Club

"Our family spent a holiday reading lots of "Secret Sevens" and "Famous Fives" so my head was buzzing with passwords and secret clubs.... Moody Margaret's password, "nunga" was one of my son's favourite nonsense words."