Intense But Not enjoyable

Fast, violent, deadly, with intense suspense.
I think an ultimate fear is losing control of our own minds, or choices. This book dives into that fear and drags it into that dark place, then it adds rape, torture, sex salvery, and running for your life. It is intense. Jane the main character, rams though her targets, try to find her husbands killer, and save her son from an unspeakably horrific threat. The bad guys are so ruthless, my stomach churned during several scenes. Jane is an incredible character, smart, and twisted enough to do what needs to be done.
Why only 3 stars ? Several reasons. One, it was too dark, there was so little hope and too much taken away. It left me with a hopeless feeling, I didn't want to continue many times. Oi, to feel such despair it hurts. The threat to the child, was too much for me. I will not continue the series for fear of where Mr. Koontz will go with that. I can't go there, can't fear for that happening. Then there was the fact that this book had two separate time lines going on switching back and forth with each short chapter. I found that really disruptive. Finally the ending, it just stoped, like mid breath just stoped-cliffhanger extreme.
I think it did what it was ment to do. It shocked, upset and drove adrenaline rushing through my body. It just wasn't my idea of an entertaining read.