Great Bend Community Theatre’s next production, the murder-suspense drama “Deathtrap,” opens Thursday at the Crest Theater.Director Karen Kline-Martin said the all-volunteer cast has been working since January to bring the classic thriller by Ira Levin to the stage. The synopsis:Sidney Bruhl, played by Doug Simmons, is a successful writer of Broadway thrillers who is struggling to overcome a dry spell which has resulted in a string of failures and a shortage of funds. Then he receives a script from a student, which Sidney recognizes could be a potential Broadway hit.