The Double Dorothy: Tordotcom

As the Fairweather approaches the halfway point of its journey, Dorothy Gentleman may have reached the end of hers...

It's been a long lifetime, and Dorothy's current body is on its last legs. With a new terminal diagnosis from Medical, she's counting the days until her next reembodiment. But then a young man with someone else's face sits down and claims he is Dorothy's next embodiment - someone has triggered the system early, using the memory-book Dorothy last updated over a month ago.

Meaning that according to the laws, when Dorothy dies this time - it will be permanent.

Now Dorothy and her doppelganger must sift through that last month of memories, looking for a secret someone's trying to erase. And all the threads lead back to the very first murder that happened on the Fairweather, five hundred years ago. A case which remains unsolved - and in which Dorothy was a witness, not a detective. All while an old enemy finally dares to step out of the shadows..."