A surprise gift takes Alana to Sin Friday, a Hall Room where anonymity is the perfect excuse to unleash lust, unbridled passions and clandestine contacts. In her first experience there, she meets a man covered by a fox mask who she immediately identifies as the co-worker who drives her upside down and, despite her innate shyness, she lets herself be drawn into an exciting labyrinth of unknown sex. However, the situation gets complicated when the chemistry between Alana and the fox goes up in flames, taking her beyond what was going to be a simple sordid and furtive encounter. Little by little she will discover that appearances deceive and that things and some people are not as she believed. Welcome to Sin Friday, a novel in which the senses awaken and love appears without seeking it.