From The Perry Mason TV Show Book
Chem student Marv Adams is popular for his drowning-duck trick. He can make a duck sink in water with a special chemical solution. Marv is about to go to court for a new trick: poisoning Donald Briggs. Perry believes that Adams is innocent but he must bust two cases in one to prove it. The key evidence lies in finding out the truth about the murder case that sent Adams's father to the gas chamber eighteen years before.