There Was An Old WomanPaperback - 1993
It all starts with a noisy toilet. Benny's janitor, Kogan, is too preoccupied with the death of his girlfriend, Lizzy Oldridge, an elderly woman who appears to have starved to death. Lizzy may have died hungry, but she had plenty of money, and somehow former alderman and mayoralty candidate Thurleigh Ramsden, an unsavoury character if there ever was one, has gained control of it. As Benny gets enmeshed in the case the body count increases alarmingly--but what's happened with the plumbing?
Book 8 in the Benny Cooperman Mystery series.