Harper joins Margaret on her journey to see the world. While on the journey they encounter a strange crystal cavern, which unfortunately afflicts him with "mineralization" on his left arm. Margaret feels intensely guilty, worrying it is the Sealomimi analog of her own Zaltazar's Syndrome.

Fortunately mineralization is a benign condition, which is treated by the locals of Siren Island with natural remedies. Harper continues to insist on journeying with Margaret. While traveling they get a pet purrmaid (basically a cat mermaid) whom they name Puck, as they found him sliding on ice.