All eyes are on Vatican City today for the start of the conclave to elect the 267th pontiff.
The race to succeed Pope Francis, who died last month, is seen as wide open.
In a process that's been virtually unchanged for 800 years, 133 cardinals will gather in the Sistine Chapel to start multiple rounds of voting.
'Conclave' author Robert Harris says he did extensive research for the book, which was recently turned into a film.