Encyclopedia Brown is a series of children's mystery books by Donald J. Sobol. Each book contains several short stories ending with a mystery for the reader to solve along with "Encyclopedia" Brown, the protagonist.

Brown, along with, I suspect, much of the Encyclopedia Brown readership, was definitely fated to be a geek when he got older. Nice to see intelligence portrayed as being unquestioningly a good thing to have, for once, without any weird nerd stigma attached to it.

Sobol also wrote a novel for slightly older kids called Secret Agents Four.