Perry gets a call from Dr. Blane, who is being blackmailed by his son-in-law Jack Hardisty, who is married to Sue. Jack has stolen about $100k from the bank of which Blane is chairman. An audit is coming. The deal: Jack will return $75k if Blane makes up the rest and everybody keeps quiet. Although Blane was wise to call Perry, Blane also tells his neighbors the Stragues and nature photographer Beaton. Before Perry gets there, Jack is shot, and Paul finds Blane with the body. Perry defends Blane against a pleasant prosecutor Hale (played by Paul Fix). Perry suspects the $75k is the motive, and the hidden clock/camera relate to an alibi that does not pan out. Beaton's camera has an f3.5 lens and he shoots at f4.5 with flash triggered by a tripwire. The culprit takes one picture and then resets the aperture to f22 to f33 allowing a second (blank) shot, tiggered by the trip cord connected to a mechanical clock winding key, to be taken at a later time. Of course, the culprit would have to return to disconnect from the clock and reset to f4.5. Here, the culprit was running a badger game (a frequent Mason theme) and decided the $75k was more lucrative. The idea that scopolamine was a truth serum was largely discredited by the time of the episode. It was being used for motion sickness. Because it causes the victim to lose focus (and possibly hallucinate), it would not be the drug of choice to get a quick reveal of money location. In more current times, scopolamine has been a date rape drug. Toward the end, Perry notes that cross-examination is like prospecting. When you find a vein, you go with it. In this episode, Della gets to show off her reasoning abilities.