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Fablehaven by Brandon Mull
When Kendra and Seth go to stay at their grandparents' estate, they discover that it is a sanctuary for magical creatures and that a battle between good and evil is looming.
If you like the Fablehaven series you might like:

The Alchemyst by Michael Scott
While working at pleasant but mundane summer jobs in San Francisco, fifteen-year-old twins, Sophie and Josh, suddenly find themselves caught up in the deadly, centuries-old struggle between rival alchemists, Nicholas Flamel and John Dee, over the possession of an ancient and powerful book holding the secret formulas for alchemy and everlasting life.

The Amulet of Samarkand by Jonathan Stroud
Nathaniel, a magician's apprentice, summons up the djinni Bartimaeus and instructs him to steal the Amulet of Samarkand from the powerful magician Simon Lovelace.

Dragon Slippers by Jessica Day George
Orphaned after a fever epidemic, Creel befriends a dragon and unknowingly inherits an object that can either save or destroy her kingdom.