Known Plot Thus Far: In 1957, Indiana Jones is thrust back in action, venturing into the jungles of South America in a race against Soviet agents to find the mystical Crystal Skull. When last we saw Indy, he was riding off into the sunset in 1989's The Last Crusade, set in 1938 near the start of World War II. The new movie, due this spring, is set at the height of the Cold War in 1957, so the character has aged in real time — 19 years. "He's teaching and having kind of a quiet life,"...