The Stranger's Shadow: The Labyrinths of Echo (Book 4)

The Stranger's Shadow continues the adventures of Sir Max— the one-time loser who now heads the Minor Secret Investigative Force—as he hunts down trespassing monsters and investigates the use of illegal magic in the supernatural world of Echo.
Joining Max on his adventures are Sir Melifaro, Sir Juffin Hully, Sir Kofa Yox, and a bizarre cast of otherworldly characters. When people begin to die in Echo, Max must travel to the Dark Side of Echo to destroy the Lonely Shadow— shadows of the dead. But defeating the Lonely Shadow isn't the end—someone has been using the shadows to attack Echo, which will lead the redoubtable Max into a realm of unparalleled danger.