Meitantei Conan

Detective Conan is a fun show. I've seen subtitled versions of it and it's very good. The series revolves around a teenage detective whiz who is shrunken down to the size of a child by an experimental poison. He must then masquerade as an eight year old (going to school, etc.) while keeping his identity a secret and a look out for the villains that gave him the poison. Helping him is a funny inventor who gives "Conan" (an alias the character uses as a child) cool James Bond like gadgets, like a bow tie with a voice distorter and shoes that magnify kicking strength.

The mysteries Conan solves each episode are very brain teasing, but nothing impossible if you put your brain cells together and follow the clues. Though many of the cases involve murder (and some pretty elaborate ones at that) each episode is presented in a way for people of all ages, much like how I used to watch Murder, She Wrote as a kid. If the show is ever aired or released commercially in the States, you should try to find it.