The Amateurs

In a time and place only slightly removed from now, PINA, the world's largest tech company, has introduced society to a new product called "Port." This irresistible space-time travel device is mysteriously powered by nostalgia and longing: Step inside a Port and find yourself transported any place your heart desires, real or imagined. Earth's population plummets when many who pass through its portal don't come back—either unwilling or unable to return.