Can you tell if a book has been written by AI?

Can you really tell if a book has been written by an AI or not? With the advancements in technology, it's becoming increasingly difficult to distinguish between human-written works and those produced by artificial intelligence. But are there any telltale signs that can give us a clue? Perhaps the writing style, the use of language, or the overall narrative structure could be indicators. Or perhaps it's all just a matter of opinion. What do you think? Can we really tell the difference between a human author and an AI author?