The Half Life of Molly Pierce, by Katrina Leno

For most of her life, Molly has experienced episodes which she has blacked out and afterwards cannot remember what has occurred for a period of time.  As far as she knows, no one else has noticed because she's always managed to care for herself.  This changes after Molly is involved in a terrifying auto accident, where a victim (whom she has never met before) recognizes her but calls her by an entirely different name. 

It quickly becomes apparent that there is an entire group of people who know her, but under a different name, and solely from the time periods when she has blacked out.  Stranger still, no one seems to be surprised from this finding.  But no one will explain to her why this is so.

A complicated and, at times, tricky plot to follow.  The pace is perfect for the story and the mystery unravels at a satisfying pace.  The characters are a bit hard to engage with, but this is a plot-driven story.  Leno makes some effort to round out the character of Molly, but to be blunt no one really cares if she is a bad friend or a kind older sister.  We simply want to know what the heck is going on!  And that need to figure out this story is what will keep you flipping pages.