隐秘迷醉，沉醉无边。骑马与砍杀16世纪北半球

　　Following advice from her therapist, a young woman and her husband try to spice up their flagging marriage by taking part in some kinky bondage games. Meanwhile, the woman's sister, a cop, is hot on the trail of a serial killer with a penchant for blindfolds and handcuffs. Could the two be related?