Devil in Texas (Book 1, Lady Law & the Gunslinger Series)
Pinkerton Agent Sadie Michelson poses as a casino singer to investigate a Texas Senator. Before she can cozy up to her quarry, she must get past his bodyguard, William Cassidy, her long-lost lover.
An outlaw seeking redemption, Cass was lured to Texas by the promise of a Ranger badge. But he hasn't forgotten the sassy siren, who toyed with his heart. When Sadie proposes a truce, Cass suspects she's hiding something.
With assassins dogging their heels, Cass and Sadie uncover a murder conspiracy in the senate. To stay alive, they must do the one thing they're dead set against: trust each other.