Here is the listing of The Devil's Nightmare books on Amazon so that you can purchase them.
The Devil's Nightmare #1 Paperback
The Devil's Nightmare #1 E-book
The Devil's Nightmare #1 Hardcover Book
The Devil's Nightmare #2 Crimson Skyline Paperback
The Devil's Nightmare #2 Crimson Skyline E-book
The Devil's Nightmare: Crimson Skyline #2 Hardcover
The Devil's Nightmare #3 San Francisco Tremors Paperback
The Devil's Nightmare #3 San Francisco Tremors E-book
The Devil's Nightmare: San Francisco Tremors Hardcover Book
The Devil's Nightmare #4 Bloodhunt Paperback
The Devil's Nightmare #4 Bloodhunt E-book
The Devil's Nightmare: Bloodhunt #4 Hardcover
The Devil's Nightmare #5 The Devil's Accord Paperback
The Devil's Nightmare #5 The Devil's Accord E-book
The Devil's Nightmare: The Devil's Accord Hardcover Book
The Devil's Nightmare #6 The Devil Within Paperback
The Devil's Nightmare #6 The Devil Within E-book
The Devil's Nightmare #6 The Devil Within Hardcover
The Devil's Nightmare #7 And the Devil takes hold Paperback