Librarian's note: This is an alternate cover edition for ISBN13 9781461017097. Sixteen-year-old Kara Nightingale’s ordinary life is suddenly turned upside down when she dies and wakes up in a strange new world with a new career—as a rookie for the Guardian Angel Legion. Kara is pulled into the supernatural, where monkeys drive the elevators, oracles scurry above giant crystal balls, and where demons feed on the souls of mortals. With the help of her Petty Officer and friend, David, Kara hurtles towards an adventure that will change her life forever…

When seventeen-year-old Kara Nightingale is suddenly struck by lightning and dies—yet again—she finds herself back in Horizon, where angels, oracles and other supernatural beings occupy a mystical world unknown to humanity. But when Kara accidentally strikes an angel with her newfound powers and nearly kills him, she is banished to the angel prison Tartarus. What’s more, Kara soon discovers her mother’s soul has been taken by Demons. Hunted by the Legion, Kara takes refuge with a new band of angel friends. She finds herself torn with her feelings for David—when angel romance is forbidden. And when Kara decides to venture into the Netherworld to find her mother’s missing soul, will her powers be enough to save her mother and save the mortal world?

Librarian's note: This is an alternate cover edition for ASIN B0077BKGBI. Much to Kara’s horror, a horde of demons is released into the mortal world, through the Mirror of Souls. Thousands of human souls are dying every day. The Guardian Angel Legion works relentlessly at trying to secure the mortal world from Demons. But when Kara discovers the truth behind the Demon Lord's plans, can she return to Horizon safely and warn the Legion before it's too late?

Librarian's note: This is an alternate cover edition for ASIN B00815MGRQ. Kara had only just begun to enjoy her life as a mortal with David—when they are pulled back suddenly into the world of the supernatural. The Legion has made an important discovery: a new Elemental child, whose whereabouts are unknown. Kara immediately prepares herself for battle, and comes face to face with the evil Seirs—a group of mortals devoted to the Netherworld. What’s worse, someone close to her is taken. Kara and her friends embark on another dangerous journey to seek out this child. But is this being really an Elemental—or something else entirely?

Librarian's note: This is an alternate cover edition for ASIN B0098RDUQC. Having only just accomplished her last mission, Kara learns that the evil Seirs are slaughtering Sensitives that refuse to swear an allegiance to Lilith—the Netherworld’s princess and her diabolical half-sister. While on assignment, Kara discovers that Lilith is searching for an ancient weapon that can destroy mankind. The Seirs’ army grows with every Sensitive they recruit—the odds of victory are grim. With the help of her friends, Kara finds herself on another dangerous mission entrusted to her. But can Kara find the weapon before Lilith annihilates the entire human race?

Librarian's note: This is an alternate cover edition for ASIN B00C1OB3HW. As Kara settles back into the world of the living, she gets an unexpected surprise and finds herself back in Horizon—the Legion has given her a second chance. Kara and her friends face a new enemy: a Dark warlock, an ancient and evil adversary of the Legion. But when Kara finds out that their GA weapons have no effect on Dark magic, can she defeat the warlock and save the mortal world from Darkness? What’s worse, the Legion orders Kara to carry out her new mission undercover, as someone she never expected…

Kara has lost her elemental power, and with her guardian angel days behind her, all is back to normal—or so she thought. But when she's injected with a mysterious substance by a shadowy man, she begins to change…but into what? As Kara deals with the change that brews inside her, a new menace threatens the angels and the mortal world: Reapers. And now back in Horizon, it's up to Kara and her friends to figure out who is powerful enough to control the Reapers and how to stop them. What's worse, rumors of something far worse than Reapers surface, of beings more sinister and evil. Something that the Legion believed they had banished forever is now resurfacing—creatures rumored to be so powerful they could destroy Horizon forever.

Kara has survived the threat of the Reapers, but at an unspeakable cost—the Archfiends have escaped their eternal prison. Now, with the mortal world on the brink of the apocalypse, with the threat of evil beings as powerful as gods, she must break the rules and travel across the mortal world on an unauthorized mission. Along the way she must face her darkest truth . . . a truth about the change inside her, a truth that she cannot stop. Meanwhile, the Archfiends and their brutal and monstrous forces are gathering on Earth, intent on enslaving the mortal world, and to destroy Horizon and all the angels. Will Kara find the strength to not only fight her inner demons, but to take on the evil that is about to be unleashed?