It’s not often that father-and-son actors have the opportunity to upstage each other—oops! star opposite each other—but so it is in Sleuth, at the Organic Theatre through July 30. Award-winning actors Tony Mockus, Sr. and Tony Mockus, Jr. (plus assorted supporting characters) have a grand, old time as Andrew Wyke and Milo Tindel in Anthony Shaffer’s entertaining trick mystery, still popular after more than 30 years. WCT critic Rick Reed says Sleuth director Ina Marlowe ‘understands something about suspense, and the more unsavory aspects of human nature.’ Call (773) 561-5600; $25-$30.