From publisher blurb:

The ruins of Manhattan – better known as Madhaven – are a place of madness, ghosts and monsters. For some the ruins offer the promise of ancient secrets, power or treasure. For the mutants who inhabit the shattered landscape, it is truly a haven. For the Knights of the White Rose it is a hiding place. For many others, however, Madhaven is their doom.

• The ruins of Manhattan, its history, its curse and its inhabitants.
• The Mutants of Madhaven; 7 new optional player characters or villains.
• The ghosts and monsters of Madhaven and their weird powers.
• The Knights of the White Rose, their secret and their redemption.
• The magical White Rose, the greatest healing power on Rifts Earth.
• Techno-Wizard weapons and devices, plus M.D.C. bone weapons.
• Adventure setting, ideas and more.