Some of it is set in a small town in Queensland, and some on board a boat.
Carlyle lives in Auckland with four teenagers, and has crewed scientific yachting expeditions.
In 2014 she sailed across the Indian Ocean with her husband and children. They stopped in Sri Lanka, India and the Maldives. She has used settings in Thailand and the Seychelles for her novel.
As far as further adventures go, Carlyle would like to finish sailing around the world if it were not for Covid-19, and she has always wanted to be a mathematician.
But she is most likely to keep on writing and has a second thriller with a publisher.
"I have certainly got more novels to write. I am going to do this for a while."
Her stop in Whanganui was part of an eight-day author tour, and getting her to speak here was a coup for Whanganui librarian Iva Leonard.
She initially asked Carlyle to read an extract from The Girl in the Mirror for the Gonville Library Facebook page. They ended up exchanging messages and Carlyle added Whanganui to her book tour.
The Whanganui library has eight copies of The Girl in the Mirror and it has been wildly popular, Leonard said.
"It's booked out. I think it's going to be like that for some time."
Leonard is not usually a reader of thrillers, but she enjoyed the book a lot.
Emma Bugden, who interviewed Carlyle for the Whanganui event, read the whole 368 pages in one night.
