For the Guantanamo Bay inmates in solitary confinement, "Fifty Shades of Grey" provides some sort of company.
Guantanamo Bay is the most secretive prison camp and houses some of the world's notorious terrorism suspects. The main characters in the trilogy, Anastasia Steele and Christian Grey, are a big hit in the lock-up. The books are the most-checked-out of the Guantanamo library.