There are a number of inheritors to a fortune who are getting killed by a mysterious somebody whom we do not see. Each death is novel, but not terribly graphic. Who did it?
1985
2003
1975
1969
1946
1973
1944
2007
2002
2001
1995
1997
1974
1976
1934
1931
1932
1980
2023
1988