The Hardy Boys

Here's a quick ? It's a Monday Memory Teaser

Who wrote the Hardy Boys Mysteries?

I know most of you might think it was Franklin W. Dixon but that's not true. That was a made-up name that Grosset & Dunlap used for all the books.

The truth might surprise you.

Take a guess, if you know, put it in the comments section - then come back this afternoon to see if you were "write" or wrong.