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.
1990
1989
1992
1975
2017
1993
2018
1961
2019
2021
1970
2022
1939
1981
1945
1938
2014
2013
1997
