It is known throughout the Vatican as the Relatio (Narration). It is contained in two stiff, unmarked red folders and runs to around 300 pages. Lying in a safe in the papal apartments of the Apostolic Palace overlooking St. Peter's Square, it will be at the forefront of the minds of the 115 cardinals who on Tuesday filed into the Sistine Chapel to start the conclave that elects the next pope.