What's the 'harm' in letting her leave early? = I don't see any 'harm' in letting her leave early. = There's no 'harm' in letting her leave early. [=letting her leave early will not hurt anyone or cause a bad result]
I want to be sure that no 'harm' will come to her. = I want to be sure that she won't come to any 'harm'. [=that she won't be hurt in any way]
He claims that he didn't mean any 'harm'. [=that he didn't mean to hurt or bother anyone]
(..) and Bartholomew, you have to take me to your captain. I know the Code. If an adversary demands parley, you can do them no harm until the parley is complete. To blazes with the Code. She wants to be taken to the captain. And she'll go without a fuss. (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl