Patricia's mother sends her daughter into the hands of Vincent -- a married man who shares his life between his piano and lovely maids -- in order to give her an education (a sex education). Jeannette, a maid, puts Patricia on the right track by letting her witness the hot parties given by Vincent, from behind a one-way mirror. At these events, the women are dressed in black silk stockings. Things continue in this way until one evening when Patricia, dressed in black, gets to the other side of the mirror to join them.
