Judge Dredd: Necropolis: Bk. 1 by John Wagner
When the newly promoted Judge Kraken, under the influence of the mysterious and evil Sisters of Death (from the 'Deadworld' dimension which was the original home of Judge Death and the other Dark Judges), kidnaps Psi-Judge Agee, all hell breaks loose in Mega-City One! The sisters use Agee's powerful psi abilities to free the Dark Judges from dimensional limbo (where they were exiled by Judge Anderson). Now its up to Dredd, Anderson, and all the other Judges in Mega-City One to stop these extraordinarily powerful beings - before they can completely lay waste to the city, and go on to kill all the inhabitants of Dredd's future Earth!