A DR GIDEON FELL MYSTERY. In the quaint English village of Sodbury Cross, pretty Marjorie Wills is suspected of poisoning chocolates in the local confectionary shop. Her uncle, the wealthy Marcus Chesney, believes eyewitnesses are unreliable. To prove his point, he sets up a clever test in front of three witnesses and a camera. They are asked to watch a staged series of events, during which a masked man enters the room to 'poison' Chesney by feeding him a large green capsule. As expected, the experiment concludes and no one can agree on what took place, except that Marcus Chesney is dead... How is that possible? And who is the culprit? It takes Dr. Gideon Fell to unravel this Golden Age classic.