Book 7 - The Viper's Nest By: Peter Lerangis (Also Author of Book 3 - The Sword Thief)
[Here's what I got from wikipedia.org: It's no longer a game. The body count is rising. Shaken by recent events (IT IS RUMORED THAT SOMEBODY DIES IN IN TOO DEEP), Amy and Dan flee to an exotic land and trace the footsteps of their most formidable ancestor yet: a military leader of mythic proportions. Yet just as the siblings begin to master the art of ancient warfare, they confront a dangerous enemy that can't be felled with a sword: the truth. With the stakes higher than ever, Amy and Dan uncover a devastating secret that changes everything. Amy and Dan WILL FIND OUT THEIR BRANCH in military madness.] I also saw that it is released on February 2nd, 2010. RUMOR ALERT: THERE IS A RUMOR THAT THERE WILL BE A TEAM X IN BOOK 7. I GOT THAT FROM WIKIPEDIA.ORG.
