The first half of the quadruplets known as the Modestys: George and his first airship as captain and owner, Elijah and his life-sized automaton.

The Goddess Bastet gifted Otherside with an alchemical formula to alter quartz crystals, so they can get rid of polluting steam power.

The brothers head for Dilli to upgrade George's airship's steam-powered engines and try to give a soul to Elijah's living doll, thanks to the alchemically-altered crystals.

Spending two months on the other side of the world changes both their lives, as they venture away from home for the first time.

A discovery journey to another culture for two new adults.