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!