Looking for a YA investigative mystery series like Famous Five or Nancy Drew

Hi everyone,

I’m looking for recommendations for a YA book or book series that features an investigative mystery. I really enjoy the feel of classic series like Famous Five, Hardy Boys, and Nancy Drew. I love the adventure, the puzzles, and the sense of camaraderie among the characters.

Ideally, I’d like a series, but I’m also open to stand-alone books. Any suggestions?

Thanks in advance!