Parallelogram (Book 1: Into the Parallel)    by Robin Brande
Price: $6.99 USD. 78410 words. Published by Ryer Publishing  on July 1, 2011. .
High school science genius Audie Masters uses her knowledge of quantum physics to find a way into a parallel universe, where she discovers a parallel version of herself who is leading a much more exciting life. Soon Audie has a taste of that life, too, full of adventure, romance, and intriguing new mysteries of science. It's all more than she could have hoped for--until something goes wrong.

Parallelogram (Book 2: Caught in the Parallel)    by Robin Brande
Price: $6.99 USD. 66420 words. Published by Ryer Publishing  on December 16, 2011. .
Audie managed to bend the laws of physics to save her parallel self from death, but now she's trapped in the wrong universe, with no sign that her scheme to save Halli actually worked. Until she can figure out what went wrong, Audie has to pretend to be Halli--and fool everyone from Halli's parents to the guy who loves her. But what about Audie's own life? And the guy she can't forget?