When the appeals trial opens Monday in the Vatican's “trial of the century,” thousands of pages of WhatsApp text messages will be taking center stage. The chats, and audio files, provide a parallel, behind-the-scenes version of one of the most tumultuous periods in Vatican history, when Pope Francis authorized a trial of 10 people, including a cardinal, into alleged financial misconduct. They show a concerted effort to target the prime suspect, Cardinal Angelo Becciu, and some questionable conduct by Vatican police and even Francis himself. Here are some key texts.