The veils of death

the long version

In the same house that his father had committed suicide, Dick Lamont is found brutally stabbed and dying. The last words he utters are odd: 'Caught me ... never guessed ... the seventh ... ' Lamont's sister tells the investigating detective that, just before he died, their father had entrusted her with two silken squares, embroidered with strange black lines; their purpose unknown. Was there any connection between them and the murder in the empty house?