The kidnappings of the Fairies and the mystery of the "Missing 411"

Every year dozens of people suddenly disappear in US National Parks, in unexplained situations and without leaving any trace; Detective David Paulides, who for decades has been studying these mysterious cases he defined as "Missing 411", has identified some recurring patterns which, analyzed with an eye to ancient traditions (both European and Native American), bring us back to the folklore beliefs concerning the "water-babies" and other feral entities residing in the "invisible world", to which it is sometimes believed that the human being, willy-nilly, is able to access, sometimes never to return to our world.