Give this to Under the Banner of Heaven, the buzzy true-crime miniseries that recently concluded its run on FX and Hulu: It wastes little time in getting to the point. Minutes into the first episode, Detective Jeb Pyre is interviewing Allen Lafferty in a Utah jail cell. Allen's wife and daughter have just been brutally murdered by fundamentalist Mormon zealots, and in his grief and anger he unloads on the well-meaning Latter-day Saint detective.