Three Doberman dogs are holding a group of young people inside the swimming pool of a luxury villa they have snuck into in Mallorca, Mallorca, Spain. One of the boys is injured with severe bites. Despite his screams, no one comes to his aid: all the neighbors in the area are at the traditional paella with which they celebrate the beginning of summer in a nearby estate. Those attending this party suffer a strange spell that does not allow them to get into the pool because everyone who swims feels the pain of the young people. It is the eve of San Juan. A day conducive to magic.