Utterly Dauntless by L.L. Muir

Who would want to outrun a lovestruck Highlander?
He’s been searching for years, and now Gray Strachan may have finally tracked down the little witch.
Strike that. Former witch—and thief. Before she bolted, she stole his bloody heart!
Now he won’t give up the chase until he’s got it back, until she’s out of his bloodstream. Then she can go wherever she pleases…probably.

Aries has her reasons for running, but she’s not sharing. There’s a lot going on in that head of hers, and she’s got to stay clear of the man she loves if only to keep her sanity. But priorities will have to change to clear the way for basic survival when a new player joins the chase.