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Six months after the events of "Kur Rising," everything has changed for the Saturday family. The Secret Scientists are tracking Zak down to take him into custody, forcing the Saturdays into life as Airship-based fugitives.
The Saturdays must stop an invasion from the Nagas. Meanwhile, Doyle, Van Rook, and Zon continue their search for V.V. Argost.
The Saturdays travel to the jungles of Mexico, where a cryptid called the Ahuizotl has been awakened from centuries of hibernation.
The Saturdays set a course for Greenland so they can search for an ancient Sumerian tablet, but the family is forced to take a detour to Australia when the airship gets infested by Bunyips by V.V. Argost.
he Saturdays learn about a sect of Indian sorcerers who were able to drive out the spirit of Kur in the past, and they attempt to find them, in hope that group can do it again. They learned that in order to drive out the spirit of Kur a ritual, using an artifact known as the "Flute of Gilgamesh", must be performed
The Saturdays return to their headquarters to retrieve tomes from Drew's library and are ambushed by Tsul 'Kalu, a cryptid whose hand now resides at the end of Zak's Claw.
Doyle and Zak help Fiskerton come to terms with his Lemurian heritage.
The Saturdays and Abbey go to the Allegheny Mountains to help with a problem caused by the cryptid Allegewi, but Van Rook's new apprentice shows up to cause trouble for the family.
Drew reunites with Doyle, Zon, and Van Rook in the Himalayas, where they hope to learn about the orange cryptid that was stolen by Argost. Meanwhile, Doc, Zak, and Fiskterton attempt to make a deal with the rest of the Secret Scientists.
Zak's cryptid-influencing powers are put to their final test as Argost unleashes an army of cryptids on the entire world.
