As Torontonians move to the beat of the Jazz Age, war is the furthest thing from their minds. Then a fatal grenade explosion outside a west end hotel room breaks the rhythm. The room's registered occupant, a mysterious European woman calling herself Lucy, disappears before she can shed any light on the incident. Police detective Paul Shenstone believes someone is trying to assassinate Lucy. Once he has found her, he will learn the reason: she has uncovered dangerous secrets that threaten world peace. Shenstone must protect Lucy and pursue her attackers. At the same time, his own experience as an infantry officer in Flanders compels him to go beyond his police function. He feels he must help Lucy get her message to the corridors of power, so that a new war may be prevented.