Spielberg: Indiana Jones and the Last Crusade part 1
WHAT DOES THE PROTAGONIST WANT? Indiana Jones, although still interested in historic artifacts, is here interested in a goal less tangible and harder to gain than a Peruvian idol or Sankara Stone — communication with his father.
The structure of Indiana Jones and the Last Crusade is quite a bit more conventional than the structures of Raiders of the Lost Ark and Temple of Doom — those movies had four acts of roughly equal length, with three chapters in each act, for a total of twelve chapters. I find Last Crusade to be more conventionally structured, a straight-ahead three-act narrative with a prelude.