'The Horror of Dolores Roach' isn't quite the killer concept it could be

Having followed the dizzying path from one-woman play to Spotify podcast to Amazon series, “The Horror of Dolores Roach” flips the gender and venue on “Sweeney Todd,” becoming the latest show built around a serial killer. Yet the fact that its protagonist sort of stumbles into that avocation doesn’t make it more pleasant, or the show feel less derivative.