Murdoch and Crabtree are assigned to protect Prince Alfred during his visit to Toronto. But, on the very night that British Aid David Jennings warns the authorities about a possible Irish threat against the Prince, an Irish girl wearing a Brotherhood ring turns up dead. A tattoo on her shoulder is found to be covering another - the symbol of the Brotherhood; and a cipher found in her stomach is believed to hold the key to a plot against the Prince. In a town where Irish ire continues to fester against the constabulary, not even his good friend Eddie Cullen will help Murdoch in the case. In a race against the clock, Murdoch must track down the girl's killer and decipher the secret message before the insidious Brotherhood can carry out its deadly plan.