This series was originally published and planned as a novella series, similar to TV episodes. However, D.S. Wrights felt that this kind of concept was watering down the core of the story, which is why the sequel - Grantham Global - will eventually be published as a full novel, just as the announced third part, which will turn the series into a trilogy. Readers will decide if there will be more parts.
Trivia: The Dark Alley series takes place in the same city as the Blood series.