A new book detailing the secret conclave that elected Pope Leo XIV has revealed a significant security breach: a cardinal was discovered with a cellphone during the proceedings. The incident, described as "better than fiction," interrupted the initial voting process within the Vatican's Sistine Chapel.

• A cardinal was found with an active cellphone, a violation of conclave rules.
• The book, "The Election of Pope Leo XIV" by Gerard O'Connell and Elisabetta Pique, uncovers behind-the-scenes details.
• U.S. Cardinal Robert Prevost emerged as Pope Leo XIV, winning with 108 votes on the fourth ballot.