MINISERIES FINALE: This costume party episode is supposed to be the end of this HBO limited series, revealing both the identity of the murderer and the murdered – so far, we don’t know either, just that someone was killed. But speaking of killing, Big Little Lies has killed in the ratings – doing so well that HBO reportedly is considering bringing the show back for more story, and another run. Nothing’s set yet – but in today’s TV landscape, Walking Dead-level audiences are nothing to walk away from lightly.