First, Philip Gardiner investigates mankind's religious identity in "Secrets of the Serpent: In Search of the Sacred Past" (2006). Using accepted tenets of history and myth, as well as fictions like "The Da Vinci Code," Gardiner posits that humanity's spiritual bloodline can be traced to an ancient serpent cult. Next, author Crichton E.M. Miller explores the legends surrounding the ancient Celtic object known as "The Cross of Thoth" (2007). Was this symbol of antiquity employed as a navigation tool over 4,000 years ago, utilizing complex technology not previously understood or acknowledged? Finally, Gardiner interviews "The Da Vinci Code" expert Tim Wallace-Murphy and discusses his theories with respect to "The Real Bloodline" (2007) of Jesus. Casting a wide net around such mysterious subjects as the Knights Templar, sacred geometry, the Sufis, and groups known as the Secret Brotherhoods, Wallace-Murphy unveils a series of provocative teachings that challenge believers' traditional certainties. 180 min. total on three discs. Soundtrack: English.