Comtra Theatre, Route 19 in Cranberry Township, presents "Arsenic And Old Lace" through Saturday. The classic comedy tells the story of the Brewster sisters, whose "charity" was poisoning lonely old men to save them from their loneliness, and then burying them in the basement. Curtain is at 7:30 p.m. Fridays and Saturdays. Admission is $12 for plays and $15 for musicals. Box office opens at 6:45 p.m. the day of the show. Call 724-773-9896.

A murder mystery dinner theater featuring "Death and Taxes, or the Peasants are Revolting!" is planned for April 30 at Tanglewood Center, 10 Austin Ave. Doors open at 5 p.m. with dinner at 5:30 p.m. The show starts at 6 p.m. Tickets are $18 for non-members and $16 for members and are available until Tuesday. Call 724-287-0021.

<B>Kean Theatre,</B> 5847 Meridian Road, Gibsonia, presents "Doubt: A Parable," an award-winning drama by John Patrick Shanley, at 8 p.m. Friday and Saturday. Cost is $22. Tickets are available by calling 724-444-5326 or by visiting www.keantheatre.com.

<B>Quantum Theatre</B> presents "The Task" by Heiner Müller opening today and continuing through May 9 in the post-industrial space at the Gage Building, 30th and Liberty in the Strip District. The audience will journey through installation-like visions as three emissaries of the French Republic arrive in Jamaica with the mission to incite a slave rebellion. The show starts at 8 p.m. Wednesdays through Saturdays and at 7 p.m. Sundays. On site parking is available. Tickets range from $28 to $40 with a limited number of $16 tickets available for students. Call 412-394-3353 or visit www.quantumtheatre.com.<B>Pittsburgh Public Theater</B> in the O'Reilly Theater, 621 Penn Ave., presents Alan Ayckbourn's "Time of My Life" about the Stratton family's past, present and future in this comedy set in their favorite restaurant. The show runs through May 16. Tickets range from $35 to $55; students and anyone age 26 or younger pay $15. Call 412-316-1600 or visit www.ppt.org.<B>CLO Cabaret</B> presents "Nunsense" through June 6 at the CLO Cabaret at Theater Square, 655 Penn Ave. Performances begin at 7:30 p.m. Wednesdays through Saturdays, 2 p.m. Saturdays and Sundays and 1 p.m. select Thursdays, with some exceptions. Tickets are $39.50 Wednesday, Thursday and Friday evenings, $44.50 Saturday evenings, and $34.50 for matinees. Call 412-456-6666.