relative pronouns - Is it always possible to replace "where" with "in which"?

I read on this site, that we put the words "in which" instead of "where". (Now I don't find the cite). Is that true?

Answer

When in which is used to show location and introduces an independent clause, where can be used in substitute.

The story in which the hero dies.
The story where the hero dies.

Beautiful Hyde Park, in which people leisurely stroll.
Beautiful Hype Park, where people leisurely stroll.

However, it will not work with

Unless it rains tomorrow, in which case we will go to the movies.