OK, so this is the full list that he has written:

The Darkest Evening of the Year
The Good Guy
Brother Odd
The Husband
Forever Odd
Frankenstein Book One: Prodigal Son
Frankenstein Book Two: City of Night
Velocity
Christmas Is Good (with Trixie Koontz)
Life Expectancy
Robot Santa
The Taking
Life Is Good (with Trixie Koontz)
Every Day’s a Holiday
Odd Thomas
The Face
By the Light of the Moon
One Door Away From Heaven
The Paper Doorway
From the Corner of His Eye
False Memory
Seize the Night
Fear Nothing
Sole Survivor
Demon Seed (revised version)
Ticktock
Santa’s Twin
Intensity
The Key to Midnight (revised version)
Strange Highways
Chase (revised version)
ICEBOUND (revised version of PRISON OF ICE)
Dark Rivers of the Heart
Winter Moon (inspired by Invasion 1975)
Mr. Murder
Dragon Tears
Hideaway
Cold Fire
The Servants of Twilight (prev: Twilight)
Shadowfires
The Bad Place
Midnight
Lightning
Oddkins
Watchers
Twilight Eyes (expanded version)
Strangers Twilight Eyes (original version)
The Door to December
Darkfall (same as Darkness Comes)
Twilight (later: The Servants of Twilight)
Phantoms
The House of Thunder
The Eyes of Darkness
The Mask
Whispers
The Funhouse
The Voice of the Night
The Key to Midnight
The Vision
FACE OF FEAR
Night Chills
Invasion (inspiration for Winter Moon 1994)
Dragonfly
The Long Sleep
Nightmare Journey
The Wall of Masks
After the Last Race
Strike Deep
Surrounded
Hanging On
Shattered
A Werewolf Among Us
Blood Risk
Demon Seed (original version)
The Haunted Earth
Chase (original version)
The Dark of Summer
Dance with the Devil
Children of the Storm
A Darkness in My Soul
The Flesh in the Furnace
Starblood
Time Thieves
Warlock
Legacy of Terror
The Crimson Witch
Demon Child
Anti-Man
Beastchild
Dark of the Woods
Soft Come the Dragons
Hell’s Gate
The Dark Symphony
The Fall of the Dream Machine
Fear that Man
Star Quest

So, now I just need to figure out which ones I have read! And which ones I have not yet read….