The Avenger

When Herbert Wrayson, a bachelor, arrives to his apartment one night, a young woman is rummaging through his desk. When he confronts her, she claims that she was at Morris Barnes' apartment, his neighbor who lives above him. She leaves his apartment silently and makes her way to Barnes' house while he is on the phone. A few hours later, she knocks on his door once more, this time appearing frightened and weak. The corridor is dark, so she requests Wrayson's help in getting her downstairs. M...