A devil on a "mission from God," Mercy Sparx has spent years ripping halos off of whichever rogue angel Heaven orders her to, but now it appears there's a much bigger problem - her mother!

The malevolent Faustia has found a way onto Earth, and has gotten the upper hand on both Heaven and Hell. To defeat, in Mercy's own words, her "See You Next Tuesday" of a mother, her only chance is to dive deep into her memory, and relive a painful childhood in the underworld of Sheol. Collects every Mercy Sparx comic produced from 2017-2020, the "Who the F# *" encyclopedia, and over 20 pages of brand new content!