Coming of age at the end of days

the long version

"Never one to conform, Anna always had trouble fitting in. Earnest and willful, as a young girl she quickly learned how to hide her quirks from her parents and friends. But when, at sixteen, a sudden melancholia takes hold of her life, she loses her sense of self and purpose. Then the Goldschmidts move in next door. They're active members of a religious cult, and Anna is awestruck by both their son Lars and their fervent violent prophecies for the Tribulation at the End of Days. Within months, Anna's life--her family, her home, her very identity--will undergo profound changes"--Amazon.com.