Wild Lavender by Lynne Connolly

A riotous passion and a forbidden love jeopardize the future of the Emperors of London . . .

Ravishingly beautiful and accomplished, Helena has her pick of suitable bachelors—and because she is the only daughter of a powerful duke, her mother is determined she makes a good marriage. But Helena won’t marry any of them, because she is in love with the son of her family’s most dangerous enemy. Though she has now been rebuffed by her beloved, she is resolved to win him back—no matter the cost.

Tom’s forbidden love for Helena has only intensified over the years of their separation. But the discovery of his true roots has changed everything. His secret spells danger for his family and everyone he loves. Devoted to Helena, he will sacrifice anything—even his one great love—to keep her safe. And soon, caught between warring factions and hounded by a deadly assassin, the couple will be swept back together in a fight for their lives, and their destiny…