My sister and I are both logical people. We like to look at information and interpret it in our own educated ways. When we were kids, we enjoyed reading the Encyclopedia Brown series by Donald J. Sobel.
Now, my sister was more of an aficionado than I ever was. She devoured them the way that I was devouring other books. I now have the majority of the collection up in my attic library and I encourage parents to read them with their children.
Each book consists of mini "cases." Leroy Brown is known as "Encyclopedia" because he has a knack for trivia. His father is also the Chief of Police. He uses his knowledge to help his dad solve some big crimes, while simultaneously helping his peers with their mysteries. It's a little similar to Nancy Drew. The fun part with these books is that the reader is given the clues, then must deduce the truth on her own. Solutions are provided at the end of the book. It is fun to use your critical thinking skills and to test the skills of the kids in your life.