Books with author H. M. Hoover

Jenny Sadler is on a trip with her father to the planet Tanin, where he would like to learn more about a scroll he received whose makers seem to have technology and materials far more advanced than anything at the Silas P. Sadler Research Institute has ever seen. While her father becomes almost consumed with his pursuit of the culture that created the artifact, Jenny befriends Eli (an orphan and one of the only children born on Tanin), who happens to be the discoverer of the scroll and their hired guide to the site of his find. As Jenny, her father and Eli explore deeper into the ruins of what appears to be an ancient civilization, the finds they make may not be the ones they were looking for.

Lian Webster is an astrophysicist and the child of astrophysicists. Her presence on the planet Balthor is purely the product of her parents' pursuit and study of an upcoming supernova. When Lian crashes her aircar in a storm near an archeological dig of mysterious buildings abandoned on Balthor, she is pulled into a mystery bigger than the stars themselves. Join her as she struggles to save the few remaining survivors of a nearly extinct civilization.

Eleven-year-old Amy lives in a decaying underground city. Ignored by her mother and under surveillance by authorities because she can read, Amy reluctantly finds herself befriending Axel-a strange boy who claims to have come from a mythical place called ...Outside. Is Axel crazy? Amy knows there is no such place as Outside.But what if there were? What would it be like?Curious, Amy convinces Axel to escape. What she hopes to find is something Axel remembers called freedom. But what she discovers is beyond her wildest dreams.

Gareth Mitchell is about to learn that the legendary "Builders" have returned to her planet, Xilan. The problem is that these visitors on a survey expedition from Earth don't even know that she and her colony exist, let alone that they have been on Xilan for 500 years. As high-tech rediscovers low-tech, questions arise on both sides as to who is advanced and who is backward...