Econophysicists have recently been quite successful in modelling and analyzing various financial systems like trading, banking, stock and other markets. The statistical behavior of the underlying networks in these systems have also been identified and characterized recently. This book reviews the current econophysics researches in the structure and functioning of these complex financial network systems. Leading researchers in the respective fields report on their recent researches and review contemporary developments. The book also includes comment and debate on the latest issues arising out of these.