From the back cover:
"A Werewolf/Vampire crossover, this supplement presents a multifaceted story playable by Garou, Camarilla or Sabbat characters. Garou can avenge themselves on Chicago, Camarilla Kindred can fight back to save their necks during the assault, or Sabbat can attempt to use the confusion to take over the city.
Under a Blood Red Moon coincides with the release of Chicago by Night 2nd Edition, and includes:
- Details on the Garou caerns in and around Chicago
- Hints on running the story for other player character types, such as witch-hunters or mummies
- Rules fro that most loathsome of creatures: the Abomination, a werewolf who has been Embraced into the world of the Damned."