Saltine continues her Arky training under the tutelage of the powerful, mysterious, and adorable Yorbo. Meanwhile, Magnus tasks Rip and Swooper with finding a rare chess piece that is allowed to move anywhere on the board.

When Arkies begin disappearing, it's up to Rip and Saltine to find out who's responsible, even if it may bring about the end of history. Could it somehow involve Vindita? And what connection do she and Rip share?