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Carl Amari and Lisa Wolf bring you the best from the Golden Age of Radio and delve deep into film history with “name-that-movie” clips on WGN Radio Theatre from April 26, 2015.  This week: “Inner Sanctum: The Confession” with Paul McGrath and Santos Ortega (1/22/46); “Duffy’s Tavern” with Ed Gardner (2/9/49) and “The Adventures of Sam Spade: The Vapio Cup Caper ”(8/22/48).