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 fight to keep the Nagas and the other cryptids from invading the world. Meanwhile, Doyle, Zon and Leonidas Van Rook are still looking for V.V. Argost. Doyle and Van Rook seem to find evidence that Argost is dead. The Saturdays go to Hong Kong expecting the Nagi invasion to start there but turn out to be wrong. The Nagas are invading New York. After some encouragement, Zak stops the invasion and is saved by a mysterious black shadow. It turns out to be V.V. Argost who offers to (cryptically) teach Zak to better control his powers through Argost's show, Weird World. Zak accepts the deal, despite knowing that Argost is trying to somehow trick him. Zak also asked Doyle to find out as much about Argost's past as he can.
Six months after the Kur crisis, the other Secret Scientists have discovered that Zak is Kur, and are tracking him to take him into custody, forcing the Saturdays into a life as fugitives. To make matters worse, the Nagas are also after Zak, in hopes of making him their new leader. Meanwhile, Doyle and Zon go to England and have a run-in with Leonidas Van Rook (who had just had his buisness overtaken by Abbey) when looking for V.V. Argost, who has mysteriously disappeared.