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My Invented Life (edition 2009)
References to this work on external resources.
Wikipedia in English
Amazon.com Product Description (ISBN 0805089500, Hardcover)
With Roz and Eva everything becomes a contest—who can snag the best role in the school play, have the cutest boyfriend, pull off the craziest prank. Still, they’re as close as sisters can be. Until Eva deletes Roz from her life like so much junk e-mail for no reason that Roz understands. Now Eva hangs out with the annoyingly petite cheerleaders, and Roz fantasizes about slipping bovine growth hormone into their Gatorade. Roz has a suspicion about Eva. In turn, Eva taunts Roz with a dare, which leads to an act of total insanity. Drama geeks clamor for attention, Shakespearean insults fly, and Roz steals the show in Lauren Bjorkman’s hilarious debut novel.
(retrieved from Amazon Mon, 30 Sep 2013 13:39:40 -0400)
During rehearsals for Shakespeare's "As You Like It," sixteen-year-old Roz, jealous of her cheerleader sister's acting skills and heartthrob boyfriend, invents a new identity, with unexpected results.
(summary from another edition)