Book 4 of the Balky Point Adventures! Every elevator is inside a lighthouse, but not every lighthouse has an elevator-that is, a portal to all the universes. On a never-ending quest for knowledge, the quirky but wise Dr Waldo has assigned Emma, Charlie, Chuck, Ree, Ben, and Eve the task of cataloguing every elevator on Earth. But in the process of visiting all 18,000+ lighthouses, two of them run into something quite unexpected-and one of them disappears! Follow along in this fourth book in the Balky Point Adventures series for a thrilling tale that takes the intrepid teens once more through multiple universes, multiple Earths, and even to the other side of the mirror. A perfect series for readers of any age whose imaginations are inspired by a sense of wonder and discovery, with positive messages of courage and compassion woven throughout the stories. While new planets, discoveries, and mysteries unfold with every book, the books may nonetheless be read in any order.