“The 39 Steps” began life as a novel and has been made into at least three movies, but the 1935 Alfred Hitchcock version is the favorite. It's the one that Patrick Barlow and John Buchan raided for their stage version.
"Musical Comedy Murders of 1940" seeks a slasher who killed three dancers in the chorus of a musical called "Manhattan Holiday." It also has other villains. That's why playwright John Bishop had to make it the "Musical Comedy Murders of 1940," even though he wrote it in 1987: one set of villains are Nazi saboteurs.
The Immigrant, now at the New Jewish Theatre, makes you feel warm-hearted and good about America and Americans without feeling embarrassed about feeling warm-hearted and good about America and Americans. It tells the true story of Haskell Harelik, a Russian Jew who leaves the land of Cossacks and pogroms for a safer and better life in the U.S., and winds up in the small town of Hamilton, Texas. Befriended by the local banker and his wife, Harelik progresses from selling bananas from a cart to owning a prosperous dry goods and variety store.