When an inebriated ex-clergyman claims to possess the Holy Grail, Lovejoy finds himself entangled in a lethal hunt for the artifact. Lovejoy, a sharp-witted and resourceful antiques dealer, must navigate a web of greed and deception after the clergyman is found dead. He faces dangerous rivals who believe the cup is genuine and are willing to commit murder to secure it. The narrative unfolds through Lovejoy's cynical, first-person perspective, highlighting the gritty underside of the antiques trade. He must rely on his specialized knowledge and street smarts to survive the escalating violence surrounding the relic.

This novel is recognized for its distinctively irreverent tone and the charismatic, morally ambiguous nature of its protagonist. Readers often note the author's ability to blend technical knowledge of antiques with the conventions of a traditional British crime mystery. The narrative style is frequently cited for its dry wit and the protagonist's unique, often cynical, observations on human nature. The work maintains a consistent appeal for those who enjoy character-driven mysteries set within niche professional worlds.