(compiled using following website)
http://www.isfdb.org/cgi-bin/ea.cgi?Dean_R._Koontz
Novels 1980 to 1989
* Whispers (1980)
* The Voice of Night (1980)
o Variant Title: The Voice of the Night (1980)
o Variant Title: The Voice of Night (1980) [as by Brian Coffey ]
* The Funhouse (1980) [as by Owen West ]
* The Eyes of Darkness (1981) [as by Leigh Nichols ]
* The Mask (1981) [as by Owen West ]
* The House of Thunder (1982) [as by Leigh Nichols ]
* Phantoms (1983)
* Darkness Comes (1984)
o Variant Title: Darkfall (US) (1984)
* Twilight (1984)
o Variant Title: The Servants of Twilight (1985 UK) (1984)
o Variant Title: Twilight (1984) [as by Leigh Nichols ]
* Twilight Eyes (1985)
* The Door to December (1985)
o Variant Title: The Door to December (1987 UK) (1985)
o Variant Title: The Door to December (1985) [as by Richard Paige ]
* Face of Fear (1985)
* Strangers (1986)
* Watchers (1987)
* Shadowfires (1987) [as by Leigh Nichols ]
* Oddkins: A Fable for All Ages (1988)
* Lightning (1988)
* The Shadow Sea (1988)
* The Mask (1988)
* House of Thunder (1988)
* The Servants of Twilight (1988) [as by Leigh Nichols ]
* Midnight (1989)
* The Eyes of Darkness (1989)
* Dean R. Koontz: Phantoms/Whispers/Strangers/Boxed Set (1989)
* Key to Midnight (Lim Edn) (1989)