Tonight, on Most Daring ... Rescuers put their lives on the line to reach a desperate man stuck at the edge of Niagara Falls! Firefighters are locked in a race against time to free a worker crushed and trapped. A lion tamer fights to save his brother from the jaws of death! These are the incredible true stories of heart-stopping rescues ... and everyday heroes who risked their lives ... so others could live! This is ... MOST DARING!