The mystery unfolds gradually, and the "secret" is actually a series of smaller secrets that each character has to uncover and understand.
Here are some of the key secrets that are revealed throughout the book:
* The campers' identities: The book features a group of diverse teenagers with unique backgrounds and personal struggles. Throughout the story, we learn about each camper's individual secrets, their reasons for attending camp, and the things they are trying to hide.
* The camp's past: There are hints of a darker past at Camp Confidential, which the campers slowly begin to piece together. The campers discover that there is a history of strange events and disappearances at the camp.
* The camp's true purpose: The campers eventually learn that Camp Confidential isn't just a typical summer camp. It has a hidden agenda and is involved in some shady activities.
It's important to note that the specific "secret" will vary depending on the version of "Camp Confidential" you are referring to. The book has been published in multiple formats and with different storylines.
To get a better understanding of the specific secret in the version you have, you would need to provide more information about the book, like the author, publication date, or a summary of the plot.