Dorinda Brown was raised by her aunt who was married to Glen Porteous, who stole most of her money and left her. She has a distant cousin, Justin Leigh, who advises her. She has just taken a job as Linnet Oakley's secretary. Meanwhile, Glen Porteous, now called Greg Porlock, has planned a house party of several people who is is blackmailing. Mr. Tote and his wife made their money in the black market during the war; actor Leonard Carroll, gave away secrets to the Germans during WWI; Mrs. Linnet Oakley was married to Glen and remarried after Glen left her; Geoffrey Masterman falsely inherited money from his aunt by hiding her new will; and the beautiful society woman, Moira Lane stole her aunts valuable bracelet. Dorinda is invited to attend the dinner with her employer, and goes to London to purchase an appropriate gown. She is arrested as a shop lifter, and saved by Miss Silver, who saw someone put things in Dorinda's pocket. Then Dorinda finds out that the host is the "wicked uncle".