The characters all draw heavily on mythology, especially the folklore from north west Europe. They include:
Jack Capelthwaite is a family man just getting on with his life but his old life is going to catch up with him as Capelthwaite is a shapeshifting monster, a bogeyman.
Black Shuck is the leader of the gang and his name comes from the East Anglian version of the black dog
Hedley Kow, a form of Elf or Hobgoblin, shown in the story as a shapeshifting monster