A mysterious homicide deep in the woods leads to Nick and Hank reopening a long-cold missing persons case. When Nick suspects this abducted person might be a feral creature, he asks Monroe to help remind this wild child of her human nature.

As Nick delves into the trailer's weapons cabinet and his inner Grimm, the investigation of a dead construction worker leads him into a long-standing conflict in the creature world.

Nick realizes a series of child abductions that he is investigating bear a striking resemblance to the Hispanic legend of ``La Llorona.''