I can recommend the series. It's Celtic flavour fantasy, and the traditional elements of fantasy (magic, elves, dwarves) are easily missed to start. The first book is DaggerSpell. If you like the first book, you'll like the series. The story is told in a style that is a bit like the Highlander film, with a continuing story broken up with flashbacks. The stories interweave the characters from life to life (the reincarnation table in the back of some books becoming very useful). The more books that are read, the more the story and the characters build. Each further book builds on the knowledge gained from the ones previous.