Brother where art thou

Brother where art though is a dark tale of revenge. Who, though, is seeking that revenge... and why? Someone is killing off women with brunette hair and doing so in a rather macabre way! What is the reason for this - why brunettes? The story centers around a group of rich young people who are all inter-related with each other. Nathan and Shelby are brother and sister... sort of. Harper and Shelby came from the same womb at the same time... but they are not twins! But who is the murderer? The answer lies in the past... Could it be Nathan, the brother who was forced to run away from home at an early age? Is he looking to inherit the family fortune and business through murder? The police seem to think so! They also suspect Shelby, who her mother and uncle abused for years! Maybe it's Harper? The perfect and gorgeous rich girl that everyone loves...