Layers upon layers

 From the NY Times book review section:

...Ms. Jacobsen will eventually address the U.F.O. issue with which conspiracy theorists eagerly associate Area 51, but her book is not science fiction. It’s much more levelheaded. It is an assertive account, revelatory but also mystifying, of the long-hidden United States weaponry and espionage programs to which she says Area 51 is home.