Einstein's bridge

In a newborn twenty-first century, tunnels through spacetime have connected our planet with hitherto unimagined alternate universes. After many years, the genius minds working at the SSC project have reached out into the vast cosmos to achieve their greatest dream: contact. But with whom... or what? And at what cost? For something has received their message—an ancient, hostile entity searching for knowledge and life to absorb and annihilate; and entity that has now locked onto a faint, persisting signal emanating from a distant, uncommonly fertile feeding ground... called Earth.