While most of Houston's arts groups take a breather in the humidity of summer, the Tony Award-winning Alley Theatre turns up the heat. The Alley's ExxonMobil Summer Chills series always brings edge-of-your-seat thrillers to life. What better way to spend a hot summer evening than in the air-conditioned theater watching a mystery unfold? Artistic director Gregory Boyd has a deft touch at picking summer-fun plays. This year's roller-coaster ride was a lights-out funfest of Wait Until Dark and Black Comedy. Great fare, stellar acting and air conditioning. All we need now is popcorn.