Not all contagions are biological.

An evil regime, the Kriva Rasturna, is spreading to the remaining dimensions, invading both Delphinium and the plague-ridden Alchemilla in a push to claim the last of the coveted Steradian Keys. Ethan uncovers their plans along with a list of influential people that include Summer's birth parents.

Meanwhile, the battle for Lunaria rages on, with the citizens under oppressive control. If they're ever to regain freedom, they will need help, prompting Ethan and Summer to embark through The Steradian Gate, hoping to turn the tides.

Now in Alchemilla, three missions stand before them. Locate the Alchemillan Key, secure allies willing to join against the spreading evil, and determine why her parents are on a Kriva Rasturna list.

Abandoned settlements, submerged laboratories, and long sunken shipwrecks await, possessing mystery, dangers and discovery.