[Answer] 6. "The Da Vinci Code", "Angels and Demons", "Deception Point".

Step 1 : Introduction to the question "6. "The Da Vinci Code", "Angels and Demons", "Deception Point"."

...1. Mary Magdalene 2. Lewis Perdue 3. Dan Brown 4. Salman Rushdie "The Da Vinci Code" and "Angels and Demons" both feature Robert Langdon as the main character. In "Deception Point" the main character is Rachel Sexton.