Pittacus Lore I Am Number Four & next 3 Signed matched Numbered Slipcased 1st

The series comprised 7 parts in total, the subsequent books being'The Revenge of Seven','The Fate of Ten' and'United As One'. All copies are signed by Pittacus Lore, the first and 3rd books to the limitation page, the 2nd book to the title page rather than the limitation page, and the 4th book to the title page with an embossed stamp showing the limitation.