Hollowthorn (Ravenfall #2)

In this spellbinding sequel to Ravenfall, two kids with supernatural powers must venture into the Otherworld to protect the Tree of Life from a terrifying foe--or risk losing the magic of Ravenfall forever.

Best friends Anna and Colin defeated the King of the Dead on Halloween night, saving the magical Ravenfall Inn they call home. Now, with Hannukah approaching, the kids are looking forward to exploring their new powers--and maybe enjoying a little challah and peppermint cocoa, too. But then a Raven--a guardian of the supernatural world--shows up at their doorstep with a warning. A demon from Jewish lore is hunting the Tree of Life, a source of untold power and immortality. If they can't stop him, they risk losing the magic of Ravenfall forever.

As they venture into the Otherworld, Anna and Colin discover a wondrous, menacing realm full of mythological creatures... but is the true danger closer than they think?