Thank you to NetGalley, the publisher, and Ann Morgan for a copy of "Beside Myself" in exchange for my honest review. I really wanted to enjoy this book. The premise of identical twins "switching" lives intrigued me. However, I felt that the book started shifting perceptions of the young Helen (later known as Ellie) and the adult Ellie (in present tense is actually Helen) too soon. Obviously, the adult "Ellie" has a lot of mental issues, whether due to nature or nurture, which can be seen by the behavior as an adult. I could not finish this book. I stopped at about 11% and just did not want to go further. The writing seemed to be all over the place...which may have been intentional but just did not work for me.