Although this is billed as a time travel story, it is overlayed with a heavy smattering of science fiction, which I thoroughly enjoyed.
The heroine lives sometime in the not too distant future. She is pressed into travelling through space and time, via a "wormhole," to visit her great grandfather in a late twentieth century parallel universe, referred to as TwenCen. Her mission is to obtain a sample of his DNA, so that he can be cloned. The transferred unrivalled musical talent of the clone can then be exploited to make a fortune for a twenty-first century entertainment company.
Joanna is very reluctant to embark on the mission, but she is forced into a corner by her controlling, obsessed Uncle Jack, to whom she amusingly refers as Uncle Jackass.
Don't worry, I am not giving anything away with the revelation of this plan, as this is all part of the scene-setting in the first few pages of this book.
The adventure which ensues is very entertaining. There are enough twists and turns towards the end to temper some of the predictability. I felt comfortable with both of those aspects.
The author admits, in her notes and acknowledgements, that several re-writes were required, but they have paid off. The story is a good one, and it is well presented. Highly recommended.