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The main subject of the episode, discussed extensively as the 20th anniversary of its 2003 publication. The hosts read from the opening and analyze its claims about the Priory of Sion and Jesus's bloodline.

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Tom mentions reading this book when he was 12-13 years old. Published in 1982, it presents the theory that Jesus came to the south of France with Mary Magdalene and established a bloodline. Written by three authors including Michael Bagent and Henry Lincoln.

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Mentioned as Dan Brown's first book featuring the character Robert Langdon, the Harvard symbologist.

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A book that Henry Lincoln read while on holiday in 1969, which told him about the mystery of Rennes-le-Chateau and inspired him to investigate the Priory of Sion.

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One of several books mentioned that Gérard de Sèd wrote about the Cathars, demonstrating his obsession with the subject.

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One of several books mentioned that Gérard de Sèd wrote about the Cathars.

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One of several books mentioned that Gérard de Sèd wrote about the Cathars.

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One of several books mentioned that Gérard de Sèd wrote, translated as 'Occitania in revolt in the Middle Ages.'

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A book about treasure hunting published in the early 1960s that Pierre Plantard read, which told the story of Noël Corbu and inspired his Priory of Sion schemes.

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Described as 'another hugely bestselling novel that features the Cathars' published in 2006, which gives the Cathar story a feminist spin with women as priests.

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Quoted at the end of the episode as a 'fantastic book, absolutely thrilling work of history' that argues the conventional understanding of the Cathars is not true.