A good analysis of why twist endings often fail
by look i have opinions
“A book with a big twist ending has two masters: it needs to support the OSTENSIBLE reading (the one it wants you to believe until the end) and also provide evidence for the veiled reading. The problem, though, is that it the narrative usually bends and fractures under the weight of this secret, and you end up with huge holes in the logic.”
—Rahul Kanakia (x)
Kanakia’s post is worth reading in full. He goes on to suggest that in lieu of a twist ending, writers should consider milking the story for dramatic irony (the reader knows but the characters don’t) and just plain drama (showing the character’s struggles as they happen).