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The classic first-contact science fiction novel that launched the career of Jack McDevitt, the national bestselling author of Coming Home. From a remote corner of the galaxy a message is being sent. The continuous beats of a pulsar have become odd, irregular…artificial. It can only be a code. Frantically, a research team struggles to decipher the alien communication. And what the scientists discover is destined to shake the foundations of empires around this world—from Wall Street to the Vatican