Encyclopedia Brown Tracks Them Down (Encyclopedia Brown)

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!