Script review - "The Lady Vanishes" by Launder and Gilliat

This would have to be one of my favourite scripts of all time. It's so lovely and clever and fresh and funny. And the structure is to die for. Things are brought in and paid off beautifully, the characters are clearly delineated and warmly sketched. Yes I like it in part it's about cricket but also because of its cleverness and wit and excitement.

Irish is a cheerful young girl but that's all she has to be; Gilbert is given some real background (folk dancing, impoverished father) - though I do wish Iris had been given more of the nun's heroic stuff at the end (there you go, flaws). Miss Froy is the greatest secret agent of all time; the villains (Dr Hartz, the Baronness) may be evil foreigners but they are smart and gentlemanly (at the end Hartz says "good luck to them"); the subplot about the cheating couple is very adult and believable; the nun in high heels (who does a lot of heroic stuff at the end) is brilliant, going back to her country in the hour of need; Charters and Caldicott are splendid.

Break it down into sequences
A - meet all the characters in a comic, fun way - bewildered Britishers and flustered foreigners. End with the singer being murdered
B - get on the train, someone tries to kiss Miss Froy and Iris gets conked on the head, set up the passengers in the compartment and the tea and the name on the window, then go to sleep - wake up and Miss Froy is gone
C - Iris looks for Miss Froy, everyone denies her including the British (to avoid getting in trouble), Gilbert and Dr Hartz try to help, Irish sees Miss Froy's name, a woman gets on the train, Hartz persuades Iris that she imagined it but then Gilbert sees the tea and believes her - reveal that Hartz is in on it with the nun and the woman
D - Gilbert and Iris keep looking and get in a fight with the man in the compartment. Hartz reveals his plan to drug Gilbert and Iris to the nun and he drugs them...
E - But they wake up. Turns out the nun helped them. They rescue Miss Froy and try to put someone else in her place. They almost get away with it but Hartz figures out what's going on. And orders the train to be diverted.
F - The train is diverted but it's the dining room and the British are left. They manage to fight them off, especially Gilbert and the nun. Miss Froy reveals who she is and makes a run for it.
G -Gilbert and Irish get together and discover Miss Froy's still alive.

Wonderful stuff.