I won't be reading another John Green book for some time. I loved The Fault in Our Stars and enjoyed Looking for Alaska, but Paper Towns was just too similar to LfA to be enjoyable.
If you have not read Looking for Alaska, then by all means read Paper Towns, I'm certain you will enjoy it. You will love Q and his friends and Margo will keep you questioning.
I have always been a fan of Sherlock Holmes and Lane's adaptation/prequel, to the stories I know, was wonderful. I was engaged from the start and did not turn it off until it had finished. I'm hooked and looking forward to the next installment.