Season 3 of this darkly comic thriller has largely held up for both critics and viewers, thanks to the incomparable acting alchemy between stars Sandra Oh and Jodie Comer. In tonight's season finale, "Are You Leading or Am I?," Carolyn (Fiona Shaw) thinks she may finally have found what she's been looking for, causing all paths to converge dramatically. As the dust settles, decisions about the future will be made, but they don't include this show's fate: Season 4 already has been ordered.