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.
1976
1980
1974
1989
1949
1965
1985
2003
2013
1964
1969
2012
1981
2000
2002
2005
2010
2006
1973