The Witness discussion

I download audiobooks from the NLS site for the blind and handicapped for my 29 year old son Tim. He is quadriplegic and living in a facility near by. He normally likes Clive Cussler type books. Hero saves the world from impending disaster type books. He also likes books that move fast.
I recently downloaded The Witness and he loved it.
My question is what Nora Roberts book can I follow up with that doesn't have explicit sex. That turns him off quickly.
Thank you for your helpful suggestions.

Heyy Richard!! I adore Nora Roberts books. You can maybe try Sacred Sins (it's a serial killer thriller) Sacred Sins.
Others like The Search The Search or The Collector The Collector are really good too! But all of them have varying degrees of romance. So, you can take the best pick.
You can try J.D. Robb's books too (Nora Roberts' alias). Hope this helped :)

Thank you, I'll look into those titles and the J.D. Robb books.

I have read this quite awhile ago so must read again to know what plot is ?