Elevator to Nowhere is the 34th book in the Give Yourself Goosebumps series.
You have to do a science project with a girl named Jamie, who you have been paired with. Jamie's uncle happens to be an inventor, which makes you think this project will be much easier now! Jamie does however warn you that Uncle Darius happens to be "Extremely extreme". That means, it is best to not let him demonstrate his inventions, since they hardly ever work the way they are supposed to.
Upon arrival, you see how run down the house is. It looks like nobody has lived there in a very long time! But the two of you just think that maybe Uncle Darius just does not have the time to deal with such things and the two of you go inside. A pair of hands suddenly grab you! But it turns out to just be Uncle Darius and he brings you and Jamie into the lab, where he announces he is going to be testing one of his inventions. Which you think just looks like a typical elevator. Uncle Darius explains that it does not take you to different floors, but to different universes instead!
You decide to humor Darius, finding this hard to believe as he explains that all of the universes are the same but with one deadly difference. He then steps into the elevator and returns moments later, only to produce a box... with your head in it! He then begins to approach both you and Jamie while wielding a machete! As the both of you do, Jamie explains that it can't be the same Uncle and she remembers that once the real Uncle Darius told her of a universe where Head Hunting was a casual sport!
You begin to panic, realizing that the other you has already died in this universe, but he must be trapped in it and you're trapped in the house! The controls are somewhere in the lab, where the evil Darius is. Jamie then suggest that you and her travel to this other universe to try to find her Uncle. But you do not really know if you want to do this, until realizing that saving the real Darius may be your only chance at stopping the evil one!
You decide to use the Transvator to journey into the Head-Hunting universe to save the real uncle Darius. You and Jamie manage to safely make it to the Transvator and narrowly escape from Evil Darius. Jamie tells you to press a button and you do not have too long before the evil Darius opens the door! You must then choose which button to pick, all leading to a different universe until you find the right one...
You decide it is much safer to stay in your own universe and use one of the real Uncle Darius' inventions to help save the two of you from Evil Darius and force him to save Good Darius. However, this is not going to be easy! You barely have any idea what the inventions do and Jamie can only help with what she does know.