The Shadow Dancers

It was the ultimate case: to stop the ultimate drug... I'm Horowitz. Brandy Horowitz. My husband Sam and I are private eyes who take cases for G. O. D., Inc. - the outfit that runs the Labyrinth to infinite alternate earths filled with crime, danger...and murder. Power-mad fanatics are running a narcotic V. D. that spreads like a bug, works like a drug, and one touch hooks you for good. You don't become a junkie...you become a zombie.
'Cause this monkey's not just on your back, but in your brain - it's got a mind, and if you kick it, it kicks back with madness and death. So this beautiful black PI and wonderful Jewish sleuth have to smash the source before the drug-bug reaches our client's Home World. But the opposition's got fake Sams and Brandys set up in headquarters on the two worlds that hold any possible leads: one that never heard of civil rights...
And one ruled by the Nazis.