Negative Zone — Victor Appleton

WHEN WORLDS COLLIDE!
Young inventor Tom Swift is determined to recreate in miniature one of the most powerful forces in nature: a black hole. But Tom loses control of the experiment. He's sucked through the hole into a parallel universe, exchanging places with his perfect double -- a criminal mastermind targeted for revenge by a powerful government agent.

On the lam from the law, Tom must find a way back home. Otherwise he'll remain a hunted man for the rest of his life. And his own world will fall prey to his alter ego -- a twisted genius at the helm of Swift Enterprises, steering a course toward unlimited wealth, unlimited power, and unlimited evil!