If you read on the subway, you may have unknowingly entered the Underground New York Public Library or UNYPL.

The website of street photographer Ourit Ben-Haim (who gave us permission to reproduce these photos) beautifully and simply documents people and their books.

The images are wonderful, and the range of readers and subjects reflects the variety of people taking the subways, which is to say, everyone in the city.

However, sometimes, it’s hard to make out the titles because of visibility or circumstances, and in those cases, the photo will be listed as Unsolved to invite a crowd-sourced solution.

We can’t stand the U word, so this is a super close-up of the only currently unsolved book at the UNYPL, which its founder frankly admits now haunts her dreams. (I think I saw that same palm in the movie Dune. The sleeper awakens.) Do you recognize this book cover? Can you help crack this case?

Hat tip: CrimeHQ’s Social Media Maven, the fabulous Jen Forbus.