When author Ed Aymar wrote the first book in The Dead Trilogy, I'll Sleep When You're Dead, he planned it as a stand alone book, not as a series. He resolved conflicts, wrapped up the characters, and even killed off some characters, but after receiving overwhelming interest from readers to know what happens next, he realized he wasn't ready to say goodbye. He was careful not to continue it as an ongoing, open-ended series because he wanted a closed story with a definitive ending, and a trilogy has allowed him to do that.