Pope Francis's death at the age of 88 means the Catholic Church must choose a new leader. Here's how cardinals elect the next pontiff at the conclave.

Simply put, a conclave is the assembly of cardinals that elects a pope. The word itself comes from the Latin "com" and "clavis," meaning "together" and "key," respectively – highlighting the absolute, behind-closed-doors secrecy with which the cardinals conduct their discussions and balloting.

“The biggest mistake in the movie was the admission of a cardinal in pectore into the conclave,” said Reese. “If the name is not announced publicly by the pope in the presence of the College of Cardinals, he has no right to attend a conclave.”