When you die, your guardian angel appears next to your soul and escorts you to Heaven. Usually. If an Angel of Death is also required, they show up and do the job. Usually.
Rhodes was a twenty-something part-time librarian. Jericho was a three-thousand-something full-time avenging angel. Classic boy meets girl.
But now Heaven is recruiting a new Grim Reaper in the battle of Good versus Evil. Rhodes has to learn the ropes before the Legions of Hell attack.
But his trainer is serving a penance for conduct unbecoming an angel. His would-be recruiter unwittingly drops a house on him. And a jealous angel is gunning for him in a lethal love triangle.
When you die you go to Heaven, instead of becoming a Grim Reaper, escorting souls to Heaven, falling in love, and battling demons. Usually.