The Key to Midnight / Shattered / House of Thunder

From Author Wars - https://authorwars.com/publications/the-key-to-midnight--shattered--house-of-thunder-19381.html

Overview:

Title: The Key to Midnight / Shattered / House of Thunder
Author: Dean Koontz
Year: 1998
ISBN-10: 0425167925
Publisher: Berkley Books
Price: $22.50
Binding: Paperback
Type: Omnibus
Title Reference: The Key to Midnight / Shattered / House of Thunder
Notes: Not an omnibus, but a boxed set of three mass-market sized paperbacks.