Further, it won an Edgar Award in 1983 from the Mystery Writers of America.
Preston is a famous playwright whose life is torn apart when his fiance dies of an apparent suicide, immediately following her Broadway debut in a play of his. He sort of goes into seclusion, but returns to society with a new play, and gathers the cast and crews from that play a year before to do a read-through. In fact, he has his suspicions that his fiance was killed and that the murderer must be one of those in the theater -- and the play and rehearsal is a trap to try and find out who.
The video is available on Netflix, and if you have any interest in seeing it, I recommend getting the DVD there. But if you don't subscribe to the service or Amazon Prime (for all I know, it's available there, as well), I have a bonus for you --
Here is the entire movie!