High Quality Content by WIKIPEDIA articles! The Secret Series is a `secret` adventure series written by Pseudonymous Bosch, whose writing style is similar to that of Lemony Snicket`s, author of A Series of Unfortunate Events. The series centers around three middle school children, Cass, Max-Ernest, and Yo-Yoji, and their adventures as members of the Terces Society, a group that keeps a mysterious Secret from being found out or stolen by the Midnight Sun society. One of the subplots of the series is the alchemists of the Midnight Sun searching for the secret to immortality, and the Terces Society`s plans to stop them.