Holmes/Watson fanatics may find Charles Marowitz’s dark parody a shallow misrepresentation of the detective duo’s relationship–and not quite humorous enough to justify the liberties taken. Others, though, might enjoy this suspenseful story about a bitter second banana’s plot to destroy his smug, condescending, maddeningly brilliant superior. The plot has enough twists to engage mystery buffs motivated by the thrill of the puzzle, and the performances in this attractive staging are competent. Still, the lack of sympathetic characters (except for a daffy Scottish housekeeper, well played by Kate Young) strains Marowitz’s comedy. If this Watson killed this Holmes, who would really care? Through 10/2: Wed 8 PM, Thu 2 and 8 PM, Fri 8:30 PM, Sat 5:30 and 9 PM, Sun 2:30 PM. Drury Lane Oakbrook, Roosevelt and Butterfield, Oakbrook Terrace, 630-530-0111. $22-$44.