With the funeral of Pope Francis concluded, preparations are under way for the beginning of the Papal Conclave, which will see the eligible members of the College of Cardinals enter isolation and vote on who becomes the new pope.

The conclave is a time-honored process conducted in secrecy behind the locked doors of the Vatican’s Sistine Chapel.

As Pope Francis's funeral approaches, 'Conclave' author Robert Harris discusses the papal selection process and why predicting the next pope is impossible.