Sara Sanabria, writer, and his lover, Adolfo Santolaya, lived their lives absorbed by just one obsession: the belief that, hidden in an abandoned mansion, there was a gate that ended in an unknown dimension. Seeking the path of his retired teacher, Enrique will reach the place where the track of the couple got lost. He will meet a odd old man who hides a lot of secrets, and he will immerse Enrique into the legend of Sara. Surrounded by mystery, he will have to discover the truth and dare to cross the last frontier.