Trilogy?

http://www.nytimes.com/2009/10/11/books/review/Zevin-t.html?_r=1&ref=review

YOUNG ADULT
Constant Craving
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By GABRIELLE ZEVIN
Published: October 9, 2009
Series sell. Call it a trilogy, smack a number on it, pump out the books at the rate of one a year. Novelists everywhere lament the diminished prospects for the proper, stand-alone novel, though this is a whole lot of foolishness. If anything, the ascendancy of the series should be encouraging. In this oppressive Twitter-verse, we, or our children at least, still embrace the long form.