For those not familiar, TV Tropes is a website that lists a number of commonly used plot devices in various media- TV obviously, as well as literature, comics, video games, etc.
It is usually a pretty funny read, as the entries are definitely pretty sarcastic. Here's their entry (http://tvtropes.org/pmwiki/pmwiki.php/Series/HardyBoysNancyDrewMysteries?from=Main.HardyBoysNancyDrewMysteries) for The Hardy Boys/Nancy Drew Mysteries.
(Be warned that sometimes there might be some foul language. Also- SPOILER alert- if you haven't seen all the episodes, you may want to proceed with caution, but the site generally hides pertinent plot spoiler details anyway. [You can highlight the hidden words to read them though.]