Isn't there basically a haunted episode in EVERY old Nickelodeon show? 🙄 Anyway, probs 'Shelby Woo' you're thinkin' of!

Maybe 'Shelby Woo'? Check it out.

Hmm, kinda sounds like 'The Adventures of Pete & Pete' but I'm not sure if they really solved mysteries. Might be one to look into though. Good luck finding it!

If it's a haunted library or museum episode you're thinking of, maybe it's actually 'Eerie, Indiana'? That's a show often confused with Nickelodeon stuff even if wasn't entirely theirs. It was all about weird happenings!

Lol! I know exactly what you mean! It took place mostly in libraries or museums. I think it could be 'Are You Afraid of the Dark?' They def had some haunting scenarios going on, if that's the vibe you're remembering. Definitely a classic Nickelodeon!

It sounds like you're describing 'Ghostwriter', which was from the mid-90s. The gang often solved mysteries involving libraries and museums. It wasn't fully Nickelodeon but had a similar feel. Could this be what you remember?

OMG, I think you might be talking about 'The Mystery Files of Shelby Woo'. 🚨 It's definitely got the mystery-solving kids vibe and if I remember right, there was an episode with a haunted museum. Hope this helps!