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Cordwainer Smith
Rod McBan (1)
Underneath
Kealan Patrick Burke
Underkill
James White
The Underhandler
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Underground Kingdom
Edward Packard
Choose Your Own Adventure (18)
Underground
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Harper Blaine / Greywalker (3)
Andrew McGahan
Jennifer de Guzman
Jerry B. Jenkins & Tim Lahaye
Left Behind: The Kids (6)
Underdead
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Underdead (1)
Undercurrents
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Telzey Amberdon (1)
Undercover
Lauren Dane
Federation (Lauren Dane) (1)
Under Which King
R. H. Benson
Under Vesuvius
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Under Twin Suns
Andrew J. Offutt
Spaceways (8)
Under the Yoke
S. M. Stirling
Draka (2)
Under the Western Acacia
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Ramses (5)
Under the Thumbs of the Gods
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Fafhrd and the Gray Mouser (1)
Under the Tangible Myrrh of the Resonant Stars
Charlee Jacob