The Fallen is a series of 7 young adult modern fantasy novels by American author Thomas E. Sniegoski. The ABC Family three-episode miniseries Fallen was loosely based on the series.
Aaron Corbet learns on his 18th birthday that he is a Nephilim, the child of a human/angel pairing, and that he is being pursued by a group of angels called the Powers. The Powers believe that all Nephilim are an abomination and affront to God. However, there is a prophecy that a Nephilim will be born that will redeem all the Fallen and return them to Heaven.
(Pocket Books, 2003)
The story starts out with introducing us to the main character, Aaron Corbet. Aaron's not such a bad kid, though he was orphaned since birth and shoved from foster home to foster home, and had some anger issues to get over and under control. He was finally adopted by Tom and Lori Stanley, and tried very hard to be a good son and a big brother to their autistic son Stevie.
Aaron meets Vilma Santiago, a beautiful girl at his high school to whom he is immediately attracted. It seems like things are finally working out for Aaron; he has everything that he has ever wanted, so he thinks. On his 18th birthday, everything changes. He starts having nightmarish dreams and visions, has trouble concentrating, experiences bad headaches, starts hearing voices in his head and feels painful changes occurring inside his body. Other weird things start happening, too. Suddenly, he has the "gift of tongues" and can speak and understand languages he had never known; he can even understand his dog Gabriel (not the archangel... sorry) talking to him. Surely Aaron is losing his mind. He reacts to this transformation with confusion; just when his world seemed normal, it now begins to unravel before his eyes.