Two brothers, Pere and Bel, arrive at the summer camp in Lluc. There, Pere is reunited with Gori and integrates Hilda, a new girl, into the group of friends, the Espiadimonis. Judith, a camp instructor, guides them to carry out the most exciting activity of all: to go hunting for 'mòpies'. During the activity, while a strange being hides in the forest, an inexplicable event occurs.
