12 books • 1 series
Crisis at Desolation Station
Where Shadows Play
Mystery in the Murky Deep (Ultimate Ending, #10)
Rescue from the Valley of Chaos
The Tower of Never There
Sabotage in the Sundered Sky (Ultimate Ending, #8)
The Ship at the Edge of Time (Ultimate Ending, #3)
The Secret of the Aurora Hotel (Ultimate Ending, #5)
Enigma at the Greensboro Zoo (Ultimate Ending, #4)
The Strange Physics of the Heidelberg Laboratory (Ultimate Ending, #6)
The House on Hollow Hill (Ultimate Ending, #2)
Treasures of the Forgotten City (Ultimate Ending, #1)
