<P> Langdon and Neveu take the keystone to the home of Langdon's friend, Sir Leigh Teabing, an expert on the Holy Grail, the legend of which is heavily connected to the Priory . There, Teabing explains that the Grail is not a cup, but a tomb containing the bones of Mary Magdalene . </P> <P> The trio then flees the country on Teabing's private plane, on which they conclude that the proper combination of letters spell out Neveu's given name, Sofia . Opening the cryptex, they discover a smaller cryptex inside it, along with another riddle that ultimately leads the group to the tomb of Isaac Newton in Westminster Abbey . </P> <P> During the flight to Britain, Neveu reveals the source of her estrangement from her grandfather ten years earlier . Arriving home unexpectedly from university, Neveu secretly witnesses a spring fertility rite conducted in the secret basement of her grandfather's country estate . From her hiding place, she is shocked to see her grandfather with a woman at the center of a ritual attended by men and women who are wearing masks and chanting praise to the goddess . She flees the house and breaks off all contact with Saunière . Langdon explains that what she witnessed was an ancient ceremony known as Hieros gamos or "sacred marriage ." </P> <P> By the time they arrive at Westminster Abbey, Teabing is revealed to be the Teacher for whom Silas is working . Teabing wishes to use the Holy Grail, which he believes is a series of documents establishing that Jesus Christ married Mary Magdalene and bore children, in order to ruin the Vatican . He compels Langdon at gunpoint to solve the second cryptex's password, which Langdon realizes is "apple ." Langdon secretly opens the cryptex and removes its contents before tossing the empty cryptex in the air . </P>

The da vinci code book by dan brown