My name is Callie Penrose – and I’m a rookie spell-slinger from Kansas City. I work part-time for the Vatican Shepherds, hunting monsters for them, but you won’t find me in the pews on Sundays. Not really my thing.

But when my boss is injured by a werewolf, it’s time for me to put my big girl pants on. Because the Spear of Longinus – the one that allegedly stabbed Jesus on the Cross – has surfaced, and it’s going up for auction. And every flavor of monster in my city wants it. Even a demon and a Nephilim, just for...