In this thrilling new adventure from the author of "Zach's Lie," 13-year-old twins Grace and Marty are sent to live with their anthropologist uncle and discover that he's obsessed with finding cryptids, mysterious creatures believed to be long extinct.

In this thrilling new adventure from the author of "Zach's Lie," 13-year-old twins Grace and Marty are sent to live with their anthropologist uncle and discover that he's obsessed with finding cryptids, mysterious creatures believed to be long extinct.

After their parents are lost in an accident, thirteen-year old twins Grace and Marty are whisked away to live with their Uncle Wolfe-an uncle that they didn't even know they had The intimidating Uncle Wolfe is an anthropologist who has dedicated his life to finding cryptids, mysterious creatures believed to be long extinct.