Spoiler alert, in case you haven't watched it yet.
Kelly Rutherford is her younger sister Jane, a cop who has raised baby Emily as her own. But now Cassidy is out of the mental hospital and wants her daughter back! Dun dun dun. Except not really, because it's the slowest burn everrrrrrr. Over halfway through and the craziest thing Cassidy does is sneak into Emily's room in the middle of the night and be nice to her. Oh, the horror.
In fact, by the end, Rutherford is so annoying that we're rooting for Henstridge to kidnap her daughter and run for it. Maybe it's all a big twist -- Jane is actually Cassidy's nightmare for