Hey guys, I need your help. I’m trying to remember the title of a book I read around 1990. I think it was part of a detective series - maybe the HardyBoys - and the detectives were three boys. It seems like they had some underground tunnel. This book was about a carnival and it seems like it had *Cat * in the title, or there was some significance to a carnival cat. I think the climax took place in the carnival funhouse.
Any takers?
It sounds more like one of the Three Investigators books by William Arden.
awed silence
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Thanks, skutir, that’s the one 
Hey, yeah, I remember those. Great childhood memories.
Actually, the series had several different authors, I always thought the Robert Authur ones were the best.
Re the ‘underground tunnel,’ I recall the boys had a clubhouse in a mobile home trailer under a pile of junk in a junkyard. It had several secret entrances.