Bette Davis and Joan Crawford give riveting performances in this film...and the entire concept where a woman is keeping her parapeligic sister captive and under her control shows me that Rob Reiner's MISERY was not as original as I thought it was.  The movie drags at times...but the tension is palpable and the legendary feud between the two actresses really elevates their hate-filled performances.  The black and white photography is a nice touch because it adds to the drab helplessness that Blanche must have been feeling in her situation.  Jane is the quintessential crazy shut in and Bette Davis created quite an iconic, archetypal character.  I enjoyed it...but I was hoping for excitement ratcheted up to WHO'S AFRAID OF VIGINIA WOLFF levels.