"Leave no stone unturned" can be found on page 6 of "The Phantom Tollbooth" by Norton Juster.

The idiom "leave no stone unturned" means to make every possible effort to find something or solve a problem by examining every option or possibility thoroughly. It suggests a thorough and exhaustive search or investigation.

Leave no stone unturned.

I think so - the actual meaning of the sentence is that you left every stone unturned, i.e. did nothing. The usual phrasing would be "I left no stone unturned", i.e. you did everything you possibly could.

Triple negative actually. Which is okay. Even negatives cancel. if the sentence was "There was not a stone I left unturned", or "There was a stone I did not leave unturned", or "There was not a stone I did not leave turned", would mean different things...

The rule is meant to correct ambiguity where some say "I ain't got nobody", to me they don't have anyone, where logically not having nobody, implies you have somebody...

No Stone Unturned was created in 1963.