The immortal heroine, a witch, has been taken hostage by a vicious gang of mortals. They have systematically kidnaped, tortured, and murdered immortals. They stole her powers by placing a magical torque collar around her neck. 
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 SPOILERS: To save a child, the witch is dumped into a dimension that closely resembles Death Valley. Her mission is to lure a big scary vemon (half demon half vampire) into a trap. 
 Problem is, she's the vemon's `mate'. His one and only. Yep. He's waited hundreds of years, and when he smells her presence, it all `clicks'. He's pushing romance and forever on all pistons, and she's scared to death. He broke her wrist on their first encounter, but manages to save her life. There are some wonderful touching scenes where they communicate without language. She saves his tush, brings him through the porthole, and voila, he's betrayed yet again. 
 SPOILER: The mortals torture the vemom hero in the name of research. He burns with hatred towards the witch. The mortals (of course!) backed out of their bargain (who didn't see that one coming?) and kept the witch a captive along with the child she was protecting. 
 The ending is sweet and well paced. I love K. Cole and have discovered her novels are a hard habit to break.