The jazz battle between Makasu and the Egyptian goddess Maat is deadlocked until the River Styx shoves Charon down her throat. Will the afterlife convergence cause two different religions to merge their Musical Battle Robots?

Making their way through the Mesopotamian underworld of Kur, Dr. Legs and Makasu run into a formidable foe. Can a vengeful spirit who has a bone to pick with Makasu be more dangerous than a god?

Josie has been seething with rage towards Makasu ever since his own death - but is holding onto anger just waste of time? Will their musical battle rip the afterlife of Kur apart?