Heir of Light by Jill Williamson & Niki Florica

Book 4 of Blood of Kings: Legends

Summary: 

Sir Rigil Barak came to Land’s End expecting a routine mission: investigate some rumors, spy on some nobles, and above all, play the perfect knight. Instead, he is reunited with his less-than-shining past--the same past that has kept him on the road for years, fleeing his noble father's scorn and grieving the woman he thought dead.

Until now.

Because in Land's End, he sees a face he never thought he’d see again . . . at least, not outside his dreams. And if she's alive, he'll do anything for a second chance to save her.

Years of captivity to a madman left Sethe with a face full of scars and one rule: never be trapped again. Except, to keep that rule, she'll have to ask for help from Rigil, the thief who broke her heart and abandoned her long ago. Now, years later, he shows up to rescue her from Land’s End like a knight in shining armor? Who does he think he is?
And even if the boy from her past has become a real knight with real honor, can she fall for a man who lied to her?

Maybe that doesn't matter now, because Sethe’s old captor is hot on her heels with a new invention that could turn her into something worse than a prisoner. He could turn her into a weapon.

Fortunately, Rigil and Sethe always did know how to pull off a heist--and if they can steal the enemy’s deadly new weapon, they can save the kingdom. For Sethe, this means trusting Rigil without letting him anywhere near her heart. For Rigil, it means a second chance with the woman whose heart he once broke.

And this time, failure could cost them everything.

Opening Lines: 

There was more to spy craft than being impeccably dressed, or so Rigil had heard. Perhaps one day, he'd test that theory. 

Today called for rich dyes and a good tailor.