You get 'em (cue heroic music)! If you enjoyed Percy Jackson and 39 clues, and you're looking for more books with that same sense of adventure, here's a list for you:

Found by Margaret Peterson Haddix

Stormbreaker by Anthony Horowitz

The angel experiment by James Patterson

Artemis Fowl by Eoin Colfer

Fablehaven by Brandon Mull; illustrated by Brandon Dorman

The merchant of death by D.J. MacHale

The alchemyst by Michael Scott

The ruins of Gorlan by John Flanagan

Leviathan by written by Scott Westerfeld; illustrated by Keith Thompson