Encyclopedia Brown Tracks Them D

A tiny submarine that flies through the air...A half-dollar worth five thousand dollars...Some tipsy birds...A world that fits in the palm of your hand...And a case that turns out to be a real can of worms!These are just some of the ten brain-twisting mysteries that Encyclopedia Brown must solve by using his famous computerlike brain. Try to crack the cases along with him--the answers to all the mysteries are found in the back!