Encyclopedia Brown knows! America's most popular boy detective is back, with ten brand-new solve- it-yourself mysteries to challenge and entertain his fans. You can match wits with the ten-year-old supersleuth as he and his partner, Sally Kimball, puzzle over clues and make some surprising discoveries. Their case load includes artistic cheats, phony worm pills, a leaking tent, and one of the world's slowest-growing trees. And if you're stumped, Encyclopedia tells how he did it in the back of the book. But don't peek until you're stuck!