The clever conceit of this undead procedural is that Rose McIver’s Liv, a “functioning zombie” who works as a morgue assistant in a crime lab, eats brains of murder victims to absorb insights about their final memories, unavoidably also absorbing, temporarily, the personalities of the deceased. Tonight’s “zombie meal” is a literal doubleheader, with Liv and a fellow functioning zombie eating separate helpings of related murder victims. Liv eats the brains of a middle-aged dad, and Robert Buckley’s Major ingests the brains of the father’s angsty teen daughter. Their subsequent interaction is a lot of fun to watch.