An Undercover Detective's Bride - Westward Hearts, #6

Rachel Reed left Baltimore with a secret that none of her sisters are aware of. A secret so sinister she fears that drastic means need to be taken to protect herself and the ones she loves. She'd hoped she'd left the secret behind in Baltimore, until one fateful day a presence on the streets of Carson City brings the whole matter full circle. Mason Murphy's on a mission to protect a witness from a group of criminals with one intent-leave no witnesses.
Matters become complicated when the witness is the woman he fell in love with. A woman who left Baltimore abruptly and without notice. He could have lived without her. Maybe. But he can't live with the knowledge that a band of thugs wants her dead.