The third book in Alyson Noel's Immortals series is called Shadowland.
The Third book in the Ingo series is called 'The Deep'.
The third book in the Leviathan series is called Goliath.
The third book in Cynthia Hand's Unearthly series is Boundless.
The third book in the series is called A FAREWELL TO CHARMS
The third book of the Dormia series is called: The Shadow Tree.
Kathleen Duey is currently working on the third book in the trilogy.
Chains of Reaction is the name of the third book in the Perfect Chemistry series.
No, the third book in the series is called Spell Bound.
The third book in the series is called Small Steps.
The third book in the Cryptid Hunters series is called "Tentacles."
The third book in the Finishing School series by Gail Carriger is called Waistcoats & Weaponry.
The Sight. The third series is called The Power of Three.