I mean identical twins played the same character on tv shows for years.

Not really into mystery novels, but cheap movies and tv features this a lot.

I have read a book with similar plot trope.

I read, and have read, many mystery novels and I don't remember any book with this trope. I have seen this trope in several movies and television shows.

It is indeed a common trope, to the point where it’s often lampshaded or subverted. It’s not very popular to play it straight, since… it’s lazy writing. Still, if you’ve played Ace Attorney games, at least two major cases hinge on this central premise. In terms of actual books, I had to dig a little, but Agatha Christie’s Elephants Can Remember does use this.

So there's some stories where it's well executed ? If the execution is well made i don't consider it lazy writing.

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