That's because it's identical to the next two. The middle one I think just appeared on an advance readers copy, and the other is a UK edition that had a different cover her in the States. Still, I wish people wouldn't sue the same stock photos over and over.
I’m always curious about covers, and I’ve found another blog that has has occasional posts about the same cover art being used for more than one book - Eurocrime. As its name suggests, it focuses on British and European crime novels, film, and movies. My tag just covers posts on “copycat” covers.