From The Perry Mason TV Show Book
When playwright Ernest Royce is found shot to death in much the same manner as a character in one of his unproduced plays, Perry is puzzled by coincidences. Royce’s play dealt with characters very close to real people, and a murder very close to the real murder case of underworld figure Rick Valponi, who was killed in New York City twelve years before. Frank Brooks, Perry’s client, was there at the time, as were most of the other principals in the case. Perry is convinced Royce’s murder and the play are connected, but the crucial last act is missing. It will be the finale for Brooks if Perry cannot find the missing piece.
+ "Old Murders Make Fascinating Plays," Perry says, quoting the script Twice during cross. Mike Bedard 6.23.16.