From The Perry Mason TV Show Book
Joseph Kraft is not your typical used-book salesman. Behind the facade of his small shop is a thriving operation in forgeries of rare first editions that nets him $70,000 a year. But Kraft slips up when he finds that a copy of Tristram Shandy is missing.

Shortly after, Kraft is found dead inside a locked room. The death appears to be accidental; he seems to have died because of a faulty gas heater. Perry doesn’t think so, though, and before long, the police don’t either. Guess who the main suspect’s lawyer happens to be?