Wild Heather (English Ivy #2) by Catherine Palmer

Olivia Hewes has one dream: to make Chatham Manor's wool-producing venture profitable. When she meets Randolph Sherbourne, the heir of her largest competitor, the two are drawn toward a forbidden love that will mean betraying both their families and the centuries-old feud that has separated them. But when the shocking truth about the death of Randolph's father is revealed, their future happiness seems doomed.