Miranda, a teen-age girl in Pennsylvania, records the changes in her life when an asteroid-hit Moon changes its orbit. Gets pretty bleak, and the diary style wasn't very exciting for me. By page five I decided I was bored, but I read the WHOLE THING, and it was worth reading. Good survival advice in there, too.
You can tell which sister is going to die, the noble, heroic, religious one. Poor Beth, you could see it coming, couldn't you? Oh, wait, wrong book. Alex is going to Catholic high school in New York when the asteroid hits the moon and knocks it a bit askew in this companion to Life As We Knew It. He tries to take care of his two sisters, but things just get worse and worse.