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At Jodrell Band in England Observatory in England, a radio telescope has detected a mysterious signal of extraterrestrial origin—a message that may be the first communication from an interstellar civilization. Has humanity made first contact? Is the signal itself a form of alien life? Could it be a threat? If so, how will the people of Earth respond? Jack Fenwick, artificial intelligence expert, believes that he and his associates at tech startup Intelligencia can interpret the message and find a way to step into the realm the signal encodes. What they find is a complex alien network beyond anything mankind has imagined.