I am surprised this hasn't come up here. RINGER with Sarah Michelle Geller is a tale of two estranged identical twins. One made it in the world of wealth and affluence and the other is a resent recovering drug and alcoholic.
After a carefully given clue the poor sister who is running from a gang who she saw a member do a murder. She is the only witness and her rich sister as disappears (presumed dead) but poor girl infiltrates rich sisters world and then it gets to be a powerful cast that are almost always someone they are not. As if everyone in this show is playing a twin who never knew their sibling.
Every week many turns, trust me this is a great series to watch back to back if you have that option, lots happens and integrates with the plot well.
Anyone else watching Ringer??