Misc: whose ghost haunted scrooge with clanking chains and wierd sounds?

Questions

Which play has had a continuous 50-year run?

Which fictional private detective solved their last case in 1952?

In 1952 an erotic cookbook was published by Norman Douglas, intended for the "private use and benefit of a small group of friends". It included ingredients such as bull's testicles and sow's vulva. What was it called?

Which French writer won the Nobel Prize for Fiction in 1952?

We are all born mad. Some remain so." Which play?