Riddle in Ruby

Young thief Ruby Teach has finally been reunited with her friends, but her trouble has not ended. The vile Dr. Swedenborg has created a machine that steals the life force out of the unsuspecting citizens of Philadelphi, and Ruby and her friends might be the only ones brave enough to stop him.

"Training to become a soldier in a prophesied war, Ruby Teach endures experiments by army scientists who believe her bloodholds the key to victory, while Captain Teach and her motley friends embark on a daring effort to rescue her."--Provided by publisher.