There are 5 books in the Fablehaven series. The newest book is Keys to the Demon Prison which came out in 2010.

"The dialogue snaps and sizzles. . . like Harry Potter, Fablehaven can be read aloud in a family with as much pleasure for grownups as for children. . . Do yourself a favor, and don't miss the first novel by a writer who is clearly going to be a major…
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2
Rise of the Evening Star

Book cover of Rise of the Evening Star
The second book in this thrilling, bestselling series finds Kendra and her brother, Seth, returning to Fablehaven, a refuge for mythical and magical creatures, where their grandfather is the caretaker. As they work to keep a hidden artifact of great power from falling into the wrong hands, you will find…

4
Secrets of the Dragon Sanctuary

Book cover of Secrets of the Dragon Sanctuary
FOR USE IN SCHOOLS AND LIBRARIES ONLY. When 13-year-old Kendra and 11-year-old Seth are sent to stay with their grandparents in Connecticut, they find far more to do than explore the attic and the treehouse. When they come across a book that tells them to ""drink the milk,"" a whole…

5
Keys to the Demon Prison

Book cover of Keys to the Demon Prison
Since ancient times, the great demon prison Zzyzx has protected the world from the most dangerous servants of darkness, including Gorgrog, the Demon King. After centuries of plotting, the Sphinx is on the verge of recovering the five artifacts necessary to open the legendary prison. Facing the potential of a…