Defeat the Darkness

Possessed by evil, ruled by lust, driven by hunger. Can love defeat the ancient demon and turn darkness into light?

When three best friends graduated from Tulane Medical School, each with a plan to save lives not take them, they never suspected they'd face vampires and shifters, or battle ancient demons from the Underworld, hell bent on taking over an unsuspecting world.
While volunteering in a makeshift medical camp in the jungles of Guatemala, Kyle doesn't believe the local legends about men who shift into large cats, not until he is attacked by a rogue jaguar and experiences the change himself.
Amyra has waited three thousand years for the right man capable of fulfilling her needs. But Kyle rebels against being chosen by the dark demoness, but Amyra use the people he cares about most as leverage. 
Max and Shelby aren't willing to give up on him or allow Amyra to claim his soul without a fight. But will the price be too high?
When darkness finally threatens, can Shelby's light defeat the demons taking over the men?