This is a beautiful book with lots of nice, colourful pictures of the Nepal Himalayas. Almost every single trek that I know of, from Humla, Mustang to Dolpo, Manaslu, Dhaulagiri Circuit and Kachenjunga is mentioned. Even the trekking peaks are covered. Of course, the usual areas like Everest, Annapurna and Langtang are also covered.
Every trek that is being described comes with a box telling you the duration, access, highest point, trek style (whether camping is required), restrictions/permits and sidetrips. In between the treks, there are also information on Nepalese culture and traditions.
However, if you think that all this is too much for a small, glossy book like this, then you're right. I find the info on some treks quite sketchy. You'll probably need additional references if you're going into a restricted area. Another problem is that this book looks more like coffeetable book than a rugged reference to be brought into the outdoors. I would hesitate to bring it on my trips.