Kyla Stone Edge of Collapse Books Series 1-7 Apocalyptic Thriller Paperback. Titles Include – Book 1: Edge of Collapse, Book 2: Edge of Madness, Book 3: Edge of Darkness, Book 4: Edge of Anarchy, Book 5: Edge of Defiance, Book 6: Edge of Survival, Book 7: Edge of Valor. Ships via USPS Media Mail.