Returning home to their demolished HQ to gather up some old Sumerian tomes from Drew's library, the Saturdays are ambushed by Tsul'Kalu, the great hunter and previous owner of the Hand of Tsul'Kalu on the end of Zak's Claw.
Zak's 13th birthday party is filled with surprises: a visit from Ulraj and Wadi, and the takeover of a South African suburb by an organized force of rogue cryptids.