Lisa Balamaro is an ambitious arts lawyer with a secret crush on her most intriguing client: former rodeo rider and reformed art forger Tuck Mercer. In his newfound role as an expert in Old West artifacts, Tuck gains possession of the supposedly destroyed correspondence between Doc Holliday and his cousin and childhood sweetheart, Mattie. Given the unlikelihood the letters can ever be fully authenticated, Tuck retains Lisa on behalf of the letters' owner, Rayella Vargas, to sell them on the black market. But the buyer Tuck finds, a duplicitous judge from the Tombstone area, has other, far more menacing ideas. As Lisa works feverishly to make things right, Rayella secretly enlists her ex-marine boyfriend in a daring scheme of her own.