Here is what Lemony Snicket has to say on "The End" in "The End".
"The End" is a phrase that refers to the completion of a story, or the final moment of some accomplishment, such as a secret errand, or a great deal of research, and indeed, this thirteenth volume marks the completion of my investigation into the Baudelaire case, which required much research, a great many of secret errands, and the accomplishments of a number of my comrades, from a trolley driver to a botanical hybridization expert, with many, many typewriter repairpeople in between. But it cannot be said that The End contains the end of the Baudelaire's story any more than the Bad Beginning contained it's beginning. The Children's story began long before that terrible day on Briny Beach, but there would have to be another volume to chronicle when the Baudelaires were born, and when their parents married, and who was playing the violin in the candlelit restaurant when the Baudelaire parents first laid eyes on each other, and what was hidden inside that violi, and the childhood of the man who orphanedthe girl who put it there, and even then it could not be said that the Badelaire story had not begun, because you would need to know about a certain tea party held in a penthouse suite, and the baker who made the scones served at the rea part, and the bakers assistant who smuggled the secret ingredient into the scone batter through a very narrow drainpipe, and how a crafty volunteer created the illusion of fire in the kitchen simply by wearing a certain dress and jumping around, and even then the bginning of the story would be as far away as the shipwreck that left the Baudelaire parents as castaways on the coastal shelf is far away from the outrigger on which the islanders would depart. One could say, in fact, that no story really has a beginning, and that no story really has an end, as all of the world's stories are as jumbled up as the items in the arboretum, wth their details and secrets all heaped together so that the whole story, from beginning to end, depends on how you look at it. We might even say that the world is always in media res -- a latin phrase which means "in the midst of things" or "in the middle of a narrative" -- and that it is impossivle to solve any mystery, or find the root of the trouble, and so the end is really the middle of the story, as many people will live long past the close of chapter thirteen, or even the beginning of the story, as a new child arrive at the chapters close.
You will probably have no idea what most of it is about, but the concept can apply to all naratives.