This is an complete guide to the books in the Deverry cycle by Katharine Kerr
The Deverry cycle has a twisted timeline consisting of a present day (from Jill's birth and onwards) and a past life storyline. In the last book, The Silver Mage, the two timelines will come together. Katharine Kerr describes the twisted timeline as two lines that interlace and interacts with each other. But that in the end you will see that the past and the present are both just two sides to the same thing and that the two lines actually is only one line that weaves itself' 'over and under to form the volumes, like knots.