SOLVED. YA Mystery series - not Hardy Boys but similar. [s]

[Jennifer]

It was a series, it revolved around 3 (?) boys who ran a detective agency. They had a cool clubhouse in an old junkyard and one of them had won a contest where they got a Rolls Royce and a chauffer for some amount of time. (maybe a year?) I think one of the boys was named Jupiter or something space-y like that. He was a nerdy, stuffy, genius kid, and he and his pals went around solving mysteries. I read it in middle school, so 1995-1998 time frame.

[Genesistrine]

The Alfred Hitchcock and the Three Investigators series by Robert Arthur

https://www.goodreads.com/series/4220...

[Jennifer]

That's it! Thanks!

[Genesistrine]

Cheers!

[Kris]

Glad you found your book series, Jennifer. Here's the first book of Genesistrine's find - The Secret of Terror Castle by Robert Arthur.