Mona Moon and her new husband, Robert Farley, Duke of Brynelleth are about to board an ocean liner to Merry Old England for their honeymoon when Mona receives an urgent telegram from Rupert Hunt, her eyes and ears in the Moon copper mines.

POTENTIAL RIOT AT MONTANA MINE STOP DEAD MINER STOP POSSIBLE MURDER STOP COME AT ONCE STOP RUPERT HUNT

Since the copper mines are the financial backbone of Moon Enterprises, Mona has no choice but to drop her plans and travel to Montana on the next train. She and Robert descend into a world of seething resentments, bitter accusations against Moon Enterprises, and bad decisions that pose a threat to Mona's world. She travels incognito to search out the truth of Rupert's allegations against the mining management. She must decide if Rupert is trying to prevent an innocent man from being hung for murder or if he is part of a grandiose plot against her. After all, Mona had been kidnapped by Rupert while searching for the Swift silver mine a year ago. Rupert is a scoundrel, but Mona hired him to be her scoundrel. Is this another of Rupert's games? Regardless of the threat, Mona must get to the bottom of it. Thank goodness Robert is by her side . . . or could Robert have his own agenda?