Alternate Possibilities - the Dimensional Transaction Unit — Patrick Jones

The world as you know it is about to change. The Dimensional Transaction Unit will allow you to visit parallel universes, opening previously unknown markets in other dimensions. As Austin, Katherine and Jonathan prepare to present their new invention to the world, they are about to encounter more obstacles than they had anticipated. The biggest obstacle is its activation, which sends them and their benefactor, Shelley, on trips into dimensions where they meet versions of themselves. This would all be fun if there was a way for them to return home. Will they spend the rest of their lives in these other worlds that are strangely familiar but not, or can they survive this trip and get back home?