Witness 8

"A former resident of the ultra-elite Manhattan enclave, Ruby now works as a maid and nanny in the type of houses she used to live in. Unassuming, she sees everyone's dirty secrets from the inside of their beautiful, renovated brownstones. But when Ruby witnesses the murder of one of the residents--seeing the killer in plain sight--she has twisted plans in mind that don't involve telling the authorities the truth"--