The Key to His Castle by Blanche Dabney

How far would you go to change your past?
When Heather Frazer is swept back through time to medieval Scotland, she has one goal, find the man who ruined her family and stop him. She’s prepared to do whatever it takes to save her family. Except fall in love.

Fierce Laird Gavin MacGregor doesn’t know why the strange woman hates him so much. All he knows is that she’s the most beautiful creature he’s even seen. She says she’s come to ruin him. But if that’s true why do her sapphire blue eyes say something entirely different? As history sits on a knife edge Heather finds herself falling for the handsome laird. But with her time in the past fast running out, she must make a life changing decision. What matters more? Revenge or true love.