Royce Lie Detectors Series by Barbara Metzger

Alone in the world, Amanda Carville has no dowry, no reputation left, and no one who believes her to be innocent of murder, since she was found holding the gun that killed her stepfather. Viscount Rexford also has his troubles. He's scarred by war, and cursed--or blessed--with the family trait of knowing the truth when he hears it, and his success at extracting the truth from military prisoners has left many doubting his honor and his methods... moreAlone in the world, Amanda Carville has no dowry, no reputation left, and no one who believes her to be innocent of murder, since she was found holding the gun that killed her stepfather. Viscount Rexford also has his troubles. He's scarred by war, and cursed--or blessed--with the family trait of knowing the truth when he hears it, and his success at extracting the truth from military prisoners has left many doubting his honor and his methods. When Amanda tells him she didn't do it, he believes her. Tired of the truth business, Rex refuses to get involved...until his heart leaves him no choice. less

He’s a master of disguises— but he can’t mask true loveSpymaster Harry Harmon’s new assignment is to spy on enemies at a country house party. To do that, he’ll require a courtesan— learned, truthful, and beautiful... Poor, sensible, smart Simone Ryland has come to Mrs. Burton’s bawdy house in search of work. But instead, she finds Harmon in need of her special “skills.”

THE Lies are undeniable- but the truth is harder to see... Daniel Stamfield has become invaluable to the British Army for his ability to detect the truth from the enemy's lies. After years of service, Daniel finally takes a respite for some wine, wenches, and wagering. Unfortunately, he didn't bet on the lovely Miss Corisande Abbott and her unsavory reputation to swagger back into his life... moreTHE Lies are undeniable- but the truth is harder to see... Daniel Stamfield has become invaluable to the British Army for his ability to detect the truth from the enemy's lies. After years of service, Daniel finally takes a respite for some wine, wenches, and wagering. Unfortunately, he didn't bet on the lovely Miss Corisande Abbott and her unsavory reputation to swagger back into his life. But as time passes, Daniel realizes he wants to make an honest woman of Corey-and an honest man of himself. less