What do a black spoon, magic tattoos and the Ultra-Speedy Courier Service have in common? Nothing really, at least not until letter courier Joe Cazenary makes contact with a demon lord while delivering his route on Monday morning. Hell hath no fury like demonspawn not given the right-of-way, and Joe soon finds out that in addition to actually doing his job for once, he must rise to the challenge of becoming the legendary hero El Cartero, delivering a Primary package of pain to Hell's minions while saving humanity (or at least the customers in his zip code) from obliteration.
A substandard courier even on his best day, Joe is thrust into a violent whirlwind of magic, mayhem and mail delivery that will push his limited skills, endurance, and sanity well beyond their normal boundaries. But that's okay, because nobody ever accused Joe of being normal!