LitCharts assigns a color and icon to each theme in The Da Vinci Code, which you can use to track the themes throughout the work.
Conspiracies and Secrets
Art and Symbolism
Faith vs. Knowledge
Sacred Femininity and Revisionist History
Power and Manipulation
Summary
Analysis
Sister Sandrine leaves a message for the last number of her list. Her other phone calls revealed that three of her contacts are dead. Years ago, a messenger instructed her to call these unidentified men if the church’s floor panel was ever broken—a sign that the brotherhood’s security has been breached. Now, Silas appears. He asks where the keystone is, but Sandrine doesn’t know. Silas is disgusted that she serves the brotherhood. Sandrine replies she cannot see Jesus’s message in Opus Dei. Silas strikes her with the iron candlestick. Sandrine dies, fearing “the precious truth” has been lost.
Sandrine’s effort to alert others to Silas’s search for the keystone fails—every one of her contacts in the brotherhood is dead. Based on what the reader knows from other characters’ perspectives, these phone numbers likely belonged to Saunière and the three sénéchaux. The plan, presumably, was that if any one of these four told the lie which would lead their attacker to Saint-Sulpice, Sandrine would notify the others, raising the alarm that they were in danger. Since Silas killed them all before visiting the church, this plan is now useless. Silas views Sandrine’s collusion with the brotherhood as a betrayal of her Christian faith. She feels similarly about his association with Opus Dei, presumably because of its controversial practices. Sandrine’s final thought recalls Saunière’s desperation to pass on the secret before it died with him.