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Mentioned as exemplifying the theory of the Holy Grail as a secret bloodline of Christ: 'the one that is best exemplified by Holy Blood and Holy Grail.'

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Mentioned as a book discussed in the previous episode alongside The Da Vinci Code, dealing with conspiracy theories about buried treasure and bloodlines

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Tom mentions reading this book when he was 12 or 13 years old, published in 1982. It presents the theory that Jesus came to the south of France with Mary Magdalene and established a bloodline guarded by the Priory of Sion. The hosts explain it was inspired by Henry Lincoln's BBC Chronicle documentaries from the 1970s, and that Dan Brown's character Lee Teabing is an anagram of Michael Baigent. Two of its authors unsuccessfully sued Dan Brown for plagiarism.