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.
2001
2005
2013
2014
1996
1948
1969
1978
2000
1991
2009
2002
2020
2007
1999
1985
1982
1921
1972
