Ira Levins Broadway triumph Deathtrap melds gasp-out-loud thrills with laugh-out-loud laughs in a murderously entertaining "who'll-do-it" of a play, within a play, within aOnce-successful Sidney Bruhl has only a string of recent flops to his credit when he's sent an instant hit of thriller written by a keen follower. Is Sidney desperate enough to kill in order to claim the work as his own? Envy, ambition, betrayal, and hidden agendas intertwine in this "brimming tumbler of arsenic and Schweppes" (Time), whose ingenious plotting and dazzling twists have kept audiences on the edge of their seats for half century. The longest-running thriller in Broadway history, Deathtraps hybrid comedy-thriller format was a new animal when introduced by Levin in 1978.