When an advert appears in the newspaper for children to take part in a secret mission, children everywhere sit a series of odd tests.
They must go undercover - the fate of the world is at stake ....
They have three things in common: they are honest, talented and orphans.
In the end, just Reynie, Kate, Sticky and Constance succeed.
When an advert appears in the newspaper for children to take part in a secret mission, children everywhere sit a series of odd tests