Preston and Child suggest either starting at the beginning with the novel Relic, or with the two stand alone novels Still Life with Crows and White Fire. The latter are stand alone stories that do not require any previous background.
Preston and Child are the co-authors of the Agent Pendergast series. In chronological order, the books in which Pendergast appears are Relic, Reliquary, Cabinet of Curiosities, Still Life With Crows, Brimstone, Dance of Death, The Book of the Dead, The Wheel of Darkness, Cemetery Dance, Fever Dream, Cold Vengeance, Two Graves and White Fire. They have also published the Gideon Crew series and several stand alone novels.