Rootless, restless, nomadic, longing to escape the decay of post-war Europe, Richard and Harriet Somers flee to Australia, hoping to begin a new and freer life. Richard, a disillusioned writer, is drawn into an extreme political group headed by the enigmatic Kangaroo. In his search for ideal love, both brotherly and personal, Somers finds himself both attracted and repelled by Kangaroo -- with terrifying consequences.