If You Like Percy Jackson...

The Alchemyst by Michael Scott

Alex Rider series by Anthony Horowitz

Chronicles of Vladimir Tod by Heather Brewer

Circle of Magic series by Tamora Pierce

Daughter of Smoke & Bone by Laini Taylor

Dingo by Charles De Lint

Extraordinary Adventures of Alfred Kropp by Rick Yancy

Fablehaven series b y Brandon Mull

The Game by Diana Wynne Jones

The Hunger Games trilogy by Suzanne Collins

Maximum Ride: The Angel Experiment by James Patterson

Nobody's Princess by Esther Friesen

Oh.  My.  Gods.  by Tera Lynn Childs

Pendragon series by D.J. MacHale

Radiant Darkness by Emily Whitman

Ranger's Apprentice series by John Flanagan

The Sea of Trolls trilogy by Nancy Farmer

So This Is How It Ends series by Tui Sutherland

The Thief by Megan Whalen Turner

Thirteenth Child by Patricia C. Wrede

Un Lun Din by China Mieville

Witch and Wizard by James Patterson

Young Wizards series by Diana Duane