Time is a Wheel Kaitlyn and the Highlande - Diana Knightley

Magnus discovers a new enemy, one born from the past: A son of Samuel wants revenge.

There are competing theories, one: that time moves in a straight line from birth to death, one step after another along a path. Or two: time is a wheel. For now, his family is safe, but there is one big issue...
Lochie asked, "How many vessels are there?"
Magnus said, "There are about twenty-six, by last count."
"How many do you have in your possession?"
"We have about six, here, there are more in the kingdom. We hae lost track."
Lochie said, "I think the losin' track might be an issue."

Magnus knows he needs all of the vessels, he doesn't want to loop, and that they don't want anything, or any one , overwritten. This is imperative, history can't be undone.

Alone on the timeline they seemed safe, but are they?

With new enemies and old scores it seems that keeping the timeline straight might be the most difficult battle of all.

This is Book 18 of the Kaitlyn and the Highlander series, a love story that encompasses all time. It's a contemporary romance with a dash of history and a bit of SciFi — the series must begin with book 1.