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The probe didn't send a greeting. It emerged from hyperspace, scanned our radio frequencies, triangulated our position, and jumped back. Three weeks later, four antimatter weapons were on their way to Earth at three million miles per hour. No negotiation. No warning. No second chances. Blue Sunrise by Gregg R. Overman — hard science fiction the way it's supposed to be. ⭐⭐⭐⭐ 4.4 stars — 1,629 Amazon reviews [Read Free in Kindle Unlimited / Get it on Amazon]