From The Perry Mason TV Show Book
Someone has been leaking valuable inside information concerning secret stock purchases of the So-Cal Investment Company, causing the prices to rise and costing the company thousands of dollars. So-Cal executive Clyde Darrell hires Paul to play plumber and plug the leak.

Paul exposes Ian Jarvis, a stockbroker, but the leaks continue. Worse yet, $200,000 of So-Cal funds are missing. Clyde goes to Perry for help, at first to uncover the embezzler—but then to defend him for murder. Trouble is, Clyde believes he’s actually murdered Vera Wynne, a secretary who claimed that Clyde was behind the embezzlement. After all, Clyde admits he struggled with her and knocked her down. And by the time Clyde got help for her, she was dead.