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City of Glass - Mortal Instruments - has 560 pages.
There are 3 instruments
City of Bones is 485 pages long. Not counting the extras at the end.
As of 2013 Only the 5th book has be released (City of Lost Souls) but the in prequel 'The Infernal Devices' all the books have been released (Clockwork Angel, Clockwork Prince and Clockwork Princess) My personal favourite was the Clockwork Princess but it was very sad....But the series explains a lot of unanswered questions you might have in the Mortal Instruments
9
1000 copies have been sold
510,000 copies
40 Million Copies
320,000 copies sold as of now
For each book over 1 million copies have been sold.
Too many.
Over 500,000 copies of Nightmare have been sold as of 2011.