Sorry I don’t really have any more detail. I read this blurb about a book on either reddit or goodreads. Something about humanity discovering interstellar travel or something major like that and aliens sending a message warning humanity to stop, or else. At least that’s what I remember. Any help would be appreciated. Been searching for a couple of hours and have had no luck.
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Can’t remember large parts of the story but reminds me a bit of Childhood’s End by Arthur C Clarke
More of a short story than a book, but it could be “The Martyr” by Poul Anderson