'Escape rooms' opening up across Chicago will lock you up for fun

Behind the door of a room in Wicker Park's historic Flat Iron building are five friends who are trapped, desperate for means of escape. They jiggle combination locks, testing one permutation after another. They mutter riddles under their breaths. They study complex diagrams. They trace their fingers across the walls, feeling around for hidden clues.

"It's a math problem!" shouts Nina D'Angier, after cracking a clue. "Hey, Math Guy, come here." She tosses a marker to her husband, Aaron, the group's math expert, who begins scribbling numbers on a white board...

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