If you like The Lightning Thief

Sea of Trolls by Nancy Farmer

Fablehaven by Brandon Mull

The Akhenaten Adventure by Philip Kerr

Magyk by Angie Sage

Skulduggery Pleasant by Derek Landy

The Mysterious Benedict Society by Trenton Stewart

Odysseus in the Serpent Maze by Jane Yolen

Inkheart by Cornelia Funke

Gregor the Overlander by Suzanne Collins

Artemis Fowl by Eoin Colfer

Pandora Gets Jealous by Carolyn Hennessy

Savvy by Ingrid Law

Secret of the Sirens by Julia Golding

Medusa Jones by Ross Collins

Ranger's Apprentice by John Flanagan

Erec Rex: the Dragon's Eye by Kaza Kingsley

Theodosia and the Serpents of Chaos by R. L. LaFevers

The One-Eyed Giant by Mary Pope Osborne

Dragon Slayer's Academy series by Kate McMullen

Time Warp Trio series by Jon Scieszka

Peter and the Starcatchers by Dave Barry