Deception Island

My new novel, Deception Island, is now $15.99 on Amazon.com and BarnesandNoble.com.  Everyone who has read it likes it.  That's encouraging.  But now what?  Write a sequel?  I've been reading a lot about dark matter, higher dimensions, and virtual reality.  I'm thinking of going in that direction.  So now I'm thinking, how would we know if we are living in a world of virtual reality?  What would it be like living in or visiting a 4, 5 or even 11 dimension world.  Is that where our "programmers" live?  Any ideas out there (whatever dimension you're in)?