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.