After initialing reading Unremembered I requested this from my local library. Unremembered had left my craving more from the story, in a good way (not a cliff hanger sort of way).
We open the story in what should be a state of serenity and a dream come true; Zen and Serephina have made it to 1609, and they can finally be together. Obviously things end up not going as planned, but I was surprised by the problems Sera and Zen were having even before Diotech and Zen's illness become present. Sera struggles to hide her abilities when doing farm work, and also had troubles adjusting to Medieval times.
We see very little of Sera and Zen's romantic relationship in Unforgotten. In the beginning there are implications of Zen wanting to "teach" Sear something that they haven't done before. However, the majority of the book Sera is on a mission to save Zen, so there really isn't much time for "learning".
The plot of this book brought in new aspects that I wasn't expecting; Sera is sent on a literal journey to uncover a secret in her mind that Diotech desperately needs. A secret that Sera desperately needs too.
There were other surprises along the way, but I felt like they challenged Sera's character in a nice way. Sera comes across as an immature character at a first glance because she is so unaware of some any things. Yet, if you pay close attention, you can watch her retain everything that happens around her. She responds to each challenge and interaction along the way in a new, mature way.
More secrets are uncovered in Unforgotten, but we never get all the answers. A third book is on the horizon, to continue (or perhaps end?) the saga of Seraphina: The Lab Created "Perfect Girl"

Conclusion:
I really appreciated the direction Brody took the story in. No clichés, no disappointments. Looking forward to an exciting third book.