38 “Zoe!” Luke screamed. She saw what had alarmed him and didn’t waste time responding. Zoe herself skipped right over alarmed and went straight to terrified. She could feel the rear end of their car sagging downward. Despite gunning the Citroën, she couldn’t crawl back to the other side of the dune. Everything she and the car had weren’t enough to escape the crumbling of the Mother Dune’s crest from under her wheels. But she was on top of the dune’s collapse, not under it. Giving in to the slip, she aimed downslope and fought for high ground. She really wished she’d surfed as a kid because some practice would really help right about now. Every moment of the gigantic sand slide, the surface shifted. To hesitate was to be buried forever—or at least until the winds rolled the dunes asi