Echo 8 by Sharon Lynn Fisher

The fate of two worlds hangs in the balance as three lives entangle: Jake, a man shifted to an alternate Earth, where he has to drain energy from others to survive. Tess, the parapsychologist trying to save him. Ross, the FBI agent torn between his love for Tess and his duty to hunt down the dangerous visitors.
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(Post)Apocalyptic Action / Adventure Earth Aliens Love Triangle M / F Military / Spies / Soldiers / Mercenaries / Assassins / Prison Super Humans / Psi Powers / Shifters