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.
Right now there are 4 known books, Tunnels, Deeper, Freefall, and Closer.
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.
A four-book series is called a tetralogy.
No, but it is said that it will come out 11/8/11. That date comes from their official website.
November 24, 2009. The second book, Fading Echoes, comes out March 24, 2010.
The problem is different for each book. Tunnels book #1: Will is trying to find his Dad (which he can't find) while being a renegade of the Styx Tunnels book #2 - Deeper: Will stumbles into the Deeps and finds out about a deadly plaque that the Styx made to destroy all Topsoilers Tunnels book #3-Freefall: Will and Chester get lost in the Pore, trying to find out about the garden of Eden and find Dr. Burrows Tunnels book #4-Closer: The Styx will do their best to get revenge on Will, Chester and Dr. Burrows Tunnels book #5- will be released in 2012