 First Light is a young adult science fiction and mystery novel by Rebecca Stead , first published in 2007 . The novel follows Peter , who is in Greenland with his father and mother for research on global warming , and Thea , who lives in Gracehope , an underground colony located below Greenland . First Light explains how global warming is melting Gracehope and Peter and Thea 's attempt to persuade the people to leave . The novel addresses the effects of global warming as a theme . 
