What is the author's style in The Desperate Hours by Joseph Hayes?

Hayes', The Desperate Hours, is a suspense play. From the first mention of the prison break on the second page until the last prisoner is killed at the end, Hayes calculates each scene to make audiences wonder what is going to happen next. The playwright uses two obvious techniques to do this. First, he centers the play on a hostage situation with hostile parties forced together, so that at any given time one side or the other can be seen as winning. Second, he gives both Glenn Griffin and Dan Hilliard a degree of unpredictability, so that audiences cannot rely on either of them to behave rationally, in their own best interest. The situation might fall apart at any moment; readers have to pay close attention so that they do not miss something important.