Perry Mason takes on a very special client when 8 year-old Peggy Smith asks him to find out who she is. Perry learns that she attends a prestigious school and has been there since the age of 3. Her school and residential fees are paid automatically by the Tobler bank in Switzerland and twice a year, she receives a lovely handmade doll from a Swiss toy shop. A chance meeting with American tourists in Switzerland, Perry learns of little Peggy's family and eventually convinces her grandfather, Courtney Jeffers, that his daughter gave birth to the girl. Soon after the old man changes his will in Peggy's favor, he is killed and Perry finds himself defending Peggy's aunt, Linda Osborne, who is accused of the murder.