When the redoubtable Miss Phryne Fisher receives threatening letters at her home, she enlists her unflappable apprentice Tinker to investigate. But as the harassment of Phryne threatens to spin out of control, her lover Lin Chung is also targeted.

Meanwhile, Dot begins to fear that her fianc, newly promoted Sergeant Hugh Collins, has gone cold on their wedding. And Phryne's clever daughters Ruth and Jane begin their own investigation into suspiciously dwindling funds when they are sent to help at the Blind Institute.

None of this is quite enough to prevent Phryne from accepting an invitation to a magnificent party at the house of the mysterious Hong. When the party is interrupted by shocking tragedy, Phryne gathers all of her unerring brilliance to track down the miscreants.

With some unlikely assistance, Phryne is in a race against time to save a pair of young lovers from disgrace and death.