Detective Ellery Queen has to solve a series of murders where the victims were killed in numerically descending ages, the male victims were strangled with blue cords and the female victims with pink ones.
1997
1999
2002
1996
1955
1974
1931
1983
1971
2004
1951
1998
1958
1994
1988
2005
2023
2021
1950
