Reynie is told the address of a building and that he needs to show up there with a number three pencil because he has some tests he needs to take but he is not sure what the tests are for or about.
When Raynie gets to the address he is brought inside and has to take a test. He gets very confused by the test because it's not like a normal test that he is used to. While he is there he meets a girl named Rhona and a boy named Sticky who are also confused about why they are there and about the test.
Later the three kids find out that they all passed the test and they are sent somewhere, but this time the tests aren't on paper they're more like puzzles and to leave they have to solve all the puzzles.
Reynie, Rhonda, and Sticky complete all the puzzles and they meet the person who created all of them, Mr.Benedict.
Mr. Benedict explains to the kids that these test that he put them through were to see if they were worthy to be part of his secret society.
Reynie, Rhonda, and Sticky are told that they can go back to school like normal but they can't mention anything that happened with their adventure or what happened with Mr.Benedict and his secret society.