Lovejoy has heard of more nutters who have claimed to be in possession of the one, true Holy Grail than he has had hot dinners. He's not too impressed with the eccentric clergyman making the latest claim - especially when the good vicar turns out to be one of the finest forgers Lovejoy has ever met. But when the vicar and his lady companion end up dead it becomes clear that someone else is after the old man's artefact. To solve the mystery and protect a precious piece of history, Lovejoy puts his life on the line and acquires a surprising new partner...