It is already out and it is called Closer 4th book of the series.
Book 1)The Highfield Mole (2005) rereleased as Tunnels in 2008. Book 2)Tunnels 2 Deeper (2008). Book 3)Tunnels 3 Freefall (2009). Book 4)Tunnels 4 Closer (2010)
There is no Book 4, as the series ends with Book 3, but a new series will come out in 2011.
TornThe book will come out August 23, 2011.
The Tunnels series consists of six books in total.
You can go to www.greygriffins.com for more answers but the 4th book in the series will come out in the spring of 2010.
The book came out October 4, 2011.
The 4th book in the Amulet series was released on September 1, 2011.
There are currently 4. More could come out.
No, but it is said that it will come out 11/8/11. That date comes from their official website.
A four-book series is called a tetralogy.
November 24, 2009. The second book, Fading Echoes, comes out March 24, 2010.
In the book "Tunnels," the main problem revolves around Will's discovery of an underground civilization and their plans to wage war on the surface world. Will must navigate the dangers and complexities of this underground society while also trying to prevent the impending conflict from destroying both worlds.