The series of mysteries have been read by many generations. I'm giving this series that kept several of my summers occupied, a 5 star!
This is the first series review I've done, but here are a few things that I think are worth mentioning.
Nancy and her friends are always nice to people, making them good role models. They always solve the mysteries and manage to squeeze out of more than one tight spot, keeping everyone interesting and on the edge of their seat, so to speak. All three main girls have steady dates who often help in the mystery solving. The books introduce kids to many different cultures and even to many actual sleuthing tips. Hannah the housekeeper is very much like a mother to Nancy so these books also teach that family doesn't have to be blood. A few of the books deal with creepy things that I wouldn't read such as black magic. But other than that, this is an excellent series.