Julia and Daniel are married lovers, cheating on their respective spouses for some three years. Until they decide to make it official. They head to Mexico to celebrate their newfound freedom. And find a land over the border and over the line. A town obsessed with sex, devoid of any pretense of propriety, and home to "The Lost Passage", where absolutely every erotic fantasy is fulfilled. Join adult's most important director Paul Thomas in the film many critics are calling his greatest achievement to date. Borderline. The line is drawn. We dare you to cross.