I read a book at school in 1977, ad I'm pretty sure it had 'conspiracy' in the title. Possibly The something street conspiracy? Plot involved two gangs of kids in postwar Britain - they'd have...
I remember reading it about 10-15 years ago, it was sort of 'Weirdstone of Brisengamen'-ish, there was a group of kids who went to some mad fantasy world and had to follow a mad set of instructions,...