The first 50 people to arrive at The Mercury Theater, 3745 N. Southport, to see the acclaimed drama The Screwtape Letters on Friday, October 31 at 8 p.m. will receive a festive goody bag filled with fall treats from Wrigleyville's gourmet candy shop Candyality. The Screwtape Letters is a funny and provocative look into C.S. Lewis' brilliant novel that explores the theme of spiritual warfare from a demon's point of view.  The production, which recently had sold-out runs in New York and Washington, D.C., opens Sunday, October 12, and runs for a limited engagement.