Private eye John Taylor is - grudgingly - back in the Nightside, because the Unholy Grail is missing . . . and everyone wants its corrosive power.John Taylor, private detective with a difference, is back in the Nightside, that nightmarish realm hidden deep beneath London where it is forever 3 a.m.This time he must use his supernatural gifts to locate the Unholy Grail; the cup from which Judas drank at the Last Supper; before it falls into the wrong hands. Anyone who touches the cup will gain tremendous power - but they will also be corrupted.Angels, demons, sinners and saints are all determined to find the Unholy Grail, no matter what the cost. And it isn't long before they realise exactly who can lead them to it . . .Agents of Light and Darkness is the sequel to Something From the Nightside and the second title in Simon R. Green's New York Times bestselling Nightside series.