“Everyone in This Room Will Someday Be Dead,” by Emily Austin (Atria)In Emily Austin’s first novel, “Everyone in This Room Will Someday Be Dead,” 27-year-old Gilda is anxious, insecure and lost. She struggles to hold down a job and is a massive hypochondriac, visiting the emergency room multiple times per week.She is constantly thinking about death, how many ways there are to die, and the insignificance of her own existence.