What metaphors are used in Miss Peregrine's Home for Peculiar Children by Ransom Riggs?

In Chapter Ten, the peculiars realize that their home has, in all likelihood, been destroyed. This is important for two reasons. On a narrative level, it draws the reader further into their story, engaging them in the peculiars' struggle to face down one last challenge. On a metaphoric level, the loss of the Home means that Jacob and the other peculiars, his fellow courageous adventurers, have stepped through a door that has closed behind them. The event has created a Before and After for Jacob and the other peculiars of the sort to which Jacob himself referred at the beginning of the narrative. The shape and meaning of After, its purpose and nature, become clear in the book's upcoming, final chapter.