This one was a library book — part of a program that allowed the book to be borrowed with no restrictions (anyone could borrow it during a certain time without worrying about putting it on hold). Since it was about time travel I read it.
It was not very well written, and geared towards a young adult audience. That said, I learned a little bit about the Berlin wall. The book had a very unsatisfactory ending — although there was a clue at the beginning that the author needed to point out that sort of gave closure to the book.
I don’t plan on reading her other books in the series.