Ms Alexander's latest novel The Cedar Tree explores two centuries of secrets, betrayals and the costs of each.

The book is set in 1867 at Richmond Valleys and the Strzelecki Desert in 1949 and explores Irish immigration, the Catholic versus Protestant conflict and what this meant for new beginnings in Australia.

Based in Moree, Ms Alexander said when she started crafting the book she wanted to explore the idea of what it means to be free, regardless of whether someone is English, Irish or Italian.

"So when I say what it means to be free (it could be) on an individual basis, as a community, a society and ultimately I guess as a country," she said.

"There's this question in the novel then (that asks) how far an individual is willing to go to obtain their liberty and in doing that obviously there is a cost associated with gaining your freedom.

"Then there's that question of what happens afterwards. Can you start your life anew and not have any consequences from that?"

The author's family has been living in the bush since 1893, so where possible Ms Alexander uses her family archives for information in her novels.

"Because obviously it's primary source information, which is invaluable when you're writing historical things," she explained.

This is the first time Ms Alexander will be presenting an author talk at the Wellington Library and she was looking forward to the March 25 event.

While there she will explain to readers the research and ideas behind the book, plus Ms Alexander will share a few stories she's picked up along the way

"It will be my first time doing a book event in Wellington, so I'm really looking forward to that," she said.