Books with author H. M. Hoover

When Toby stumbles upon Orvis - an obsolete robot - he is about to shut himself down. . . forever. Toby knows how Orvis feels: no one wants her either. A spacer all her life, her too-busy-for-Toby parents have packed her away to school on Earth. But when her domineering grandmother decides to send her to school on Mars, Toby rebels. With Orvis and her only other friend Thaddeous - a lonely castoff too - the trio set off in search of sanctuary with her great-grandmother.But to get there they will have to cross The Empty.

Theodora (Theo) Leslie is a biologist for a large expedition from the Aurora Corporation surveying and exploring the planet Eridan. Something is happening at all three human bases so that almost all personnel there are becoming fearful to the point of being nonfunctional. Theo is out in the field alone for a month when she witnesses a murder. She and the lone survivor of the killing (Karen Orlov) set out to learn what has happened at the human bases and how much it has to do with a remarkable series of changes at the coming of the rainy season for Eridan. What they learn could doom (or save) the entire expedition.

It all started the day Tabitha (Toby) West learned she would have to leave her school on Earth and go to Mars. While off school grounds, feeling sorry for herself, she met a grumpy robot (ORVIS) already three days late to his arrival at his final resting spot, The Dump. Toby and Thaddeus gradually learn some of ORVIS's nearly 400 year history and become determined to save him from destruction. They unexpectedly end up joining ORVIS in a cross-continent trek to get to Toby's great-grandmother's house, where ORVIS could live in peace. In order to get there, though, they would have to survive a journey across The Empty.

Galen Innes returns to his native Earth, far in space and culture from the Marsat habitat he has left, where he hopes to make a choice about his successor as Governor-General. Samara Lloyd is a young woman whose birth into a leading corporate family on Earth is not nearly as magnificent as it might seem. Together, this unlikely duo falls afoul of a cult-like religious figure, the Dolmen, whose consolidation of power includes the murder of Samara's mother, the Director, as well as an attempt on their own lives. Follow Galen and Samara as they escape only to return once again and face down the Dolmen at the very physical and metaphysical seat of his power.

Meredith Ambrose was nicknamed "Merry" by her parents when she was a baby, but now that she can express her own opinions, they find her "boring". While visiting the family estate, she witnesses the crash landing of a strange boy (Mikel Goodman) who comes from the space habitat that Earth now calls the Shepherd Moon. Although those around her do not seem to recognize the danger that Mikel represents with his astounding abilities, she is able to convince her grandfather, the powerful General Ambrose, that Mikel is indeed a threat. In the 48th century, Earth has all but forgotten that the miniature "moons" that accompany Luna were the cause of the collapse of Earth's high-tech civilization and are still inhabited. Join Merry and her grandfather as they race to (re)capture Mikel, who is bent on taking over the entire Earth using his Controller talents. Along the way, Merry learns of the many inequities in her own society and by befriending a young girl, Sami, inadvertently learns the secret to neutralizing Mikel's most dangerous weapon.