via Goodreads

This debut, the first novel in a trilogy, is achingly romantic,
terrifying, and filled with blistering action.

When seventeen-year-old
Ellie starts seeing reapers - monstrous creatures who devour humans and send
their souls to Hell - she finds herself on the front lines of a supernatural war
between archangels and the Fallen and faced with the possible destruction of her
soul.

A mysterious boy named Will reveals she is the reincarnation of an
ancient warrior, the only one capable of wielding swords of angelfire to fight
the reapers, and he is an immortal sworn to protect her in battle. Now that
Ellie's powers have been awakened, a powerful reaper called Bastian has come
forward to challenge her. He has employed a fierce assassin to eliminate her -
an assassin who has already killed her once.

While balancing her
dwindling social life and reaper-hunting duties, she and Will discover Bastian
is searching for a dormant creature believed to be a true soul reaper. Bastian
plans to use this weapon to ignite the End of Days and to destroy Ellie's soul,
ending her rebirth cycle forever. Now, she must face an army of Bastian's most
frightening reapers, prevent the soul reaper from consuming her soul, and
uncover the secrets of her past lives - including truths that may be too
frightening to remember.