Disturbing Books & Horror Book Club discussion

Anyone read "First Night of Summer" by Landon Parham....my book club said it was a very controversial love/hate book. So of course I had to find out for myself. OMG It was the most disturbing yet compelling read that I have read in a long, long time. I really could not put it down for one second. I went through every emotion you could possibly imagine. From crying like a baby to screaming out loud in anger...I didn't think it got too graphic as some of the reviewers stated. It was really well-written with strong imagery and maybe that was just too much for some, but their is no graphic language. If you haven't read this book, you must if you aren't the faint of heart. It reads as though you are watching a movie reel in your mind. Dark and vivid, he dives deep into the mind of a sadistic killer and the father that must overcome the unthinkable when his twin girls become his next target.
First Night of Summer
Landon Parham

It sounds promising. Is it really disturbing?