The year is 1920. "A fraught task keeps Verity and her husband Sidney in the country after their initial clandestine mission has been completed: the traitor Lord Ardmore is scheming to employ the deadly phosgene gas he's stolen for some terrifying purpose, and the couple will need both the Crown Forces and the rebels' help to thwart him.
As they pursue their quarry, they are drawn into a case involving a series of cunning and brazen jewel thefts. Many believe it is the work of the Irish rebels, seeking to fund their revolution, but when Verity and Sidney are also approached by Michael..."