Intensity - Dean Koontz

Chyna Shepherd's violent childhood has taught her to be a survivor but nothing has prepared her for facing Edgler Vess, a sociopath intent on murder. He lives for one purpose only: to satisfy all appetites as they arise, seeking ever more outrageous experiences, and immersing himself in sensation. To live with intensity.

When he attacks her friend, Laura, Chyna's instincts protect her. Not knowing Laura is already dead, Chyna follows when Vess carries her body to his motor home - a dungeon and morgue on wheels. She hoped to save her friend, but instead becomes trapped there as the killer, unaware of her presence, drives away. At first her sole aim is to get out alive. But when she learns the identity of the killer's next intended victim, and when circumstances ensure that only she can save that precious life, she must face the fact that a moral life requires the acceptance of unwanted responsibilities. She discovers depths of courage she didn't know she possessed - and takes risks beyond any that she ever imagined she could endure.