Julia, Gunther, and Mary Lou are sharing a house together in Sydney, not far from downtown. The have advertised for another tenant, since it will lower everyone's housing costs. The man they choose is a gent named Bernard, personable and agreeable, who seems to be romantically interested in Julia. Meanwhile, Sydney has been undergoing a wave of bombings of government buildings and offices. Before long, Bernard's new roommates begin to wonder about him, but by the time they get seriously interested in what he's up to, he has taken steps to see to it that they don't hinder his activities. He hadn't counted on his relationship with Julia having any effect on him, however, and the outcome of the resulting stand-off is far from certain.