FYI the Hardy Boys tv show has been restarted, on Hulu. Seems from the preview that it's not based on the book series any more than the tv show Riverdale is based on the Archie comics

one of the kids drives this Chevy truck... looks like it's mid seventies, and restored

both the Hardy Boys use typical bikes for the late 70s... from the vehicles I see in the trailer, they might be setting this show in the early 80s. I'll guess 1983 based on the newest car I see in the trailer, and from the incredible success of Stranger Things. What's that got to do with it? Well, when one thing succeeds in Hollywood, it gets copied, like Riverdale seems to have paved the way for the Hardy Boys to get some screentime

 I am impressed that someone finally is kicking off a new tv show from the books, they were terrific. It's been over 45 years since the last attempt to make something happen with these characters on tv, it's long overdue for there to be a successful tv series with these characters