Los Angeles, 1921: Ex-Pinkerton Charlie Siringo is living in quiet retirement when Wyatt Earp knocks on his door and asks him to track down his missing horse. Horse thievery turns into a deeper mystery as Siringo and another ex-Pinkerton, the young Dashiell Hammett, follow clues from the streets of Los Angeles to Jack London's farm -- until they discover a conspiracy masterminded by the notorious and powerful Joseph P. Kennedy. These ragtime cowboys chase the truth in a compelling tale of the Old West and early Hollywood.