Sixteen-year-old Elena Mendoza is the product of a virgin birth.
This can be scientifically explained (it's called parthenogenesis), but what can't be explained is how Elena is able to heal Freddie, the girl she's had a crush on for years, from a gunshot wound in a Starbucks parking lot. Or why the boy who shot Freddie, David Combs, disappeared from the same parking lot minutes later after getting sucked up into the clouds. What also can't be explained are the talking girl on the front of a tampon box, or the reasons that David Combs shot Freddie in the first place.
As more unbelievable things occur, and Elena continues to perform miracles, the only remaining explanation is the least logical of all—that the world is actually coming to an end, and Elena is possibly the only one who can do something about it.