When an explosion kills wealthy industrialist Gregory Van Dyke, Police Commissioner Teddy Roosevelt presumes that anarchists are responsible and personally asks Detective Sergeant Frank Malloy to track them down. Malloy is up to the challenge--but he faces a different kind of challenge when he encounter Sarah Brandt paying a condolence call on the Van Dykes. Faced with the impossibility of ever expressing his true feelings for Sarah, Frank had vowed to never see or work with her again.