Kara knelt beside the cracked soil, the late sun turning her field notes into an off-white color. Her seismograph had recorded another tremor. It was the twelfth one in three days. Not enough to warrant headlines, but enough to make her neighbors joke about the earth’s “mood swings.”
The data didn’t amuse her. The readout showed a rhythmic pulse, not random but consistent every 26.8 seconds. She ran the numbers again. That same interval had been recorded deep under the Gulf of Guinea. It was...