“Professional Murder” Under mysterious circumstances, the famous collector and owner of a wealthy estate, Sam Rubinstein, dies. The beautiful Fanny, who works for a large antique company, is blamed for his death, because it was she who went on a car trip with him, and he never returned. Curtis, Fanny’s friend, is convinced that she is innocent. To save her from prison, he, together with private detective Arthur Crook, begins his own investigation...

“Don’t enter that door!” Young nurse Nora Dean gets a job as a nurse for a sick, wealthy woman. And on her very first night duty, someone poisoned the mistress of the house. Suspicion of murder immediately falls on Nora. At Nora's request, her acquaintance turns to Arthur Crook for help. He begins an investigation and finds out: many people wanted the capricious and quarrelsome lady to die: her relatives, acquaintances and even neighbors. When Nora is unexpectedly kidnapped and taken away by car in an unknown direction, the matter becomes even more complicated...