Having returned from Titan, Dejah reunites with her Grandfather and
Father and finds that a Criminal Underworld has gotten a foothold in
Helium led by the enigmatic Mortus. In order to discover Mortus true
identity and bring down his organization, Dejah and a notorious
Weapons Master assume different identities and infiltrate Barsoom's
criminal underworld where they encounter assassins, gangsters, and a
vile world of corruption and deceit that Dejah never knew existed.