by A.D. Slayton. Books are listed in series order.
Find the Killer Monster - Deduce the Killer from 11,000 Suspects. The Perfect Crime Has One Flaw.
Book 1 in Special Holiday Editions
Find The Elf Impostor - A Deception Mystery Logic Puzzle: Find the Impostor Among 11,000 Suspects
Book 2 in Special Holiday Editions
Find the Killer Monster - Insane Edition: 11,000 Suspects. One Killer. Pure Horrific Deduction. (Special Holiday Editions)
Book 3 in Special Holiday Editions
Find the Elf Impostor - Insane Edition: A Deception Mystery Logic Puzzle: Find the Impostor and Their Accomplice Among 11,000 Suspects
Book 4 in Special Holiday Editions