Roos Hartman is a young doctor who lives with her son in a large apartment complex. When a fellow tenant is brutally murdered, the police and Hartman's friends suspect her mysterious neighbour, Eric Coenen. As she becomes romantically involved with Coenen, she doubts he would commit such a crime, but soon she begins to investigate the case further and discovers some startling facts relating to his involvement..

Roos Hartman is a young doctor who lives with her son in a large apartment complex. When a fellow tenant is brutally murdered, the police and Hartman's friends suspect her mysterious neighbour, Eric Coenen. As she becomes romantically involved with Coenen, she doubts he would commit such a crime, but soon she begins to investigate the case further and discovers some startling facts relating to his involvement..