In Agatha Christie's adaptation of her novel, ten strangers converge on a secluded island retreat at the invitation of the owner, whom no one has met in person. As they begin to die off--in a fashion consistent with the "Ten Little Indians" nursery rhyme--and seeing no one else on the island, they start to suspect one another. Despite the chemistry between Heath Howes as rakish Philip Lombard and Lilia Vassileva as secretary Vera Claythorne, low energy and some wildly uneven British accents on opening night prevented the tension from building. By the end, however, it had reached its necessary peak, which also invigorated Christie's wit. Speaking of the ending, don't think you know it just because you read the book. Through 6/4: Fri-Sat 8 PM, Sun 3 PM, Attic Playhouse, 410 Sheridan, Highwood, 847-433-2660, $18 in advance, $20 at the door.