This is not the type of movie I generally watch but I was channel surfing and found myself drawn in by the sheer awfulness of the characters (NOT the sheer awfulness of the acting...I thought the actors all did just fine playing their despicable parts).
Plot summary: Three children of a wealthy woman hire a woman with a shady past (who desperately needs the money) to help them drive their mother insane. The hired woman is ostensibly the "heroine" but...frankly, I think it's a movie with a "protagonist" but no hero. To say anything more would reveal too much of the twisty plot but suffice to say, things are not as they appear initially.
Ultimately, I found the film just a bit too mean-spirited for a whole-hearted recommendation but it's definitely not boring!