How could a man have been murdered when he was found alone in his study, a gun in his hand, and the door locked from the inside? It had to be suicide, the police figured, for although there was no suicide note there was a letter proving conclusively...
![Double, Double [[=The Case of the Seven Murders; Seven Murders]](https://www.rulit.me/data/programs/images/double-double-the-case-of-the-seven-murders-seven-murders_1064863.jpg)
