Finished the thrd one. Not sure if it's just me but re reading I've noticed a huge writing difference between the first two books and the third one.
Interesting though being bored I was looking up Pict and it said they would have divided kingdoms and showed a map with the names. One of the names were Circenn.
Didn't she released a timeline of the highlander books? Doesn't the third one take place before the first two?