From the Vampirates blog
"Lead news this week is that I now know three out of the four US cities I’ll be visiting in September this year on my second US tour. These are (drum roll please)… Seattle (September 21st), Denver (September 22nd) and Chicago (September 27th/28th)"

Justin has published a new blog entry. He has "started writing the sixth VAMPIRATES book. The working title is IMMORTAL WAR. What do you reckon? If you’ve read EMPIRE OF NIGHT, I think you’ll understand why the next book has the word WAR in its title."

I think with the direction Sidorio is going, the word war would appear eventually. The human race does have a history of going to war to be in control of an important area or important commodity.