Three Doberman dogs are holding a group of teen inside the swimming pool of the villa they have snuck into. 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 teens. It is the eve of San Juan. A ripe day for magic.