The Case of the Vanishing Victim

Dr. Stacey Fielding takes off for Salt Lake City on business. When his plane crashes, Veronal poisioning is found in the body. Miriam Fielding is arrested since the last thing the good doctor drank was whiskey from a flash she had given him. Upon further investigation, Miriam is cleared when it's discovered that the man who really perished in the crash was Al Dolby, the plane mechanic. But where is Dr. Fielding and who did the poisoning?