Scrubby, hidden weeds snatched at their clothes like hands. No further, they whispered, go back.

OrnithologistsDanielle Wright and Luca Navarro are trying to save the Caddo Lake wetlands from an oil pipeline. Local boat tour guide Harper Benoit is trying to save her family business from collapse. None of them know that there's something much deadlier on the horizon. Not yet.

When the swamp starts drying up, and people start going missing, the three women must find the source and stop it before a sinister force consumes everything — but getting too close to it might cost them their lives.